7997015520 has 384 divisors, whose sum is σ = 30400634880. Its totient is φ = 1951672320.

The previous prime is 7997015513. The next prime is 7997015527. The reversal of 7997015520 is 255107997.

7997015520 is a `hidden beast` number, since 7 + 9 + 97 + 0 + 1 + 552 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (7997015513) and next prime (7997015527).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997015527) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7356417 + ... + 7357503.

It is an arithmetic number, because the mean of its divisors is an integer number (79168320).

Almost surely, 2^7997015520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7997015520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15200317440).

7997015520 is an abundant number, since it is smaller than the sum of its proper divisors (22403619360).

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

7997015520 is a wasteful number, since it uses less digits than its factorization.

7997015520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 45.

The square root of 7997015520 is about 89426.0337932976. The cubic root of 7997015520 is about 1999.7512623994.

The spelling of 7997015520 in words is "seven billion, nine hundred ninety-seven million, fifteen thousand, five hundred twenty".