7390721520 has 360 divisors, whose sum is σ = 30719703456. Its totient is φ = 1559181312.

The previous prime is 7390721489. The next prime is 7390721521. The reversal of 7390721520 is 251270937.

It is a tau number, because it is divible by the number of its divisors (360).

It is a super-2 number, since 2×7390721520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7390721521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 847422 + ... + 856098.

Almost surely, 2^7390721520 is an apocalyptic number.

7390721520 is a gapful number since it is divisible by the number (70) 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 7390721520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15359851728).

7390721520 is an abundant number, since it is smaller than the sum of its proper divisors (23328981936).

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

7390721520 is a wasteful number, since it uses less digits than its factorization.

7390721520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8729 (or 8707 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 7390721520 is about 85969.3056852270. The cubic root of 7390721520 is about 1947.8803634712.

The spelling of 7390721520 in words is "seven billion, three hundred ninety million, seven hundred twenty-one thousand, five hundred twenty".