1620413280 has 144 divisors (see below), whose sum is σ = 5720485680. Its totient is φ = 417199104.

The previous prime is 1620413279. The next prime is 1620413287. The reversal of 1620413280 is 823140261.

1620413280 is a `hidden beast` number, since 1 + 620 + 4 + 1 + 32 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620413287) 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, 22359 + ... + 61161.

It is an arithmetic number, because the mean of its divisors is an integer number (39725595).

Almost surely, 2^1620413280 is an apocalyptic number.

1620413280 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 1620413280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2860242840).

1620413280 is an abundant number, since it is smaller than the sum of its proper divisors (4100072400).

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

1620413280 is a wasteful number, since it uses less digits than its factorization.

1620413280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38853 (or 38842 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1620413280 is about 40254.3572796784. The cubic root of 1620413280 is about 1174.5601564824.

The spelling of 1620413280 in words is "one billion, six hundred twenty million, four hundred thirteen thousand, two hundred eighty".