1520064720 has 120 divisors (see below), whose sum is σ = 5114099016. Its totient is φ = 404619264.

The previous prime is 1520064713. The next prime is 1520064727. The reversal of 1520064720 is 274600251.

1520064720 is a `hidden beast` number, since 15 + 2 + 0 + 0 + 647 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1520064713) and next prime (1520064727).

It can be written as a sum of positive squares in 4 ways, for example, as 496576656 + 1023488064 = 22284^2 + 31992^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520064727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 482992 + ... + 486128.

Almost surely, 2^1520064720 is an apocalyptic number.

1520064720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1520064720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2557049508).

1520064720 is an abundant number, since it is smaller than the sum of its proper divisors (3594034296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1520064720 is a wasteful number, since it uses less digits than its factorization.

1520064720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829 (or 3820 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1520064720 is about 38988.0073868876. The cubic root of 1520064720 is about 1149.7957343564.

Adding to 1520064720 its reverse (274600251), we get a palindrome (1794664971).

The spelling of 1520064720 in words is "one billion, five hundred twenty million, sixty-four thousand, seven hundred twenty".