76985640 has 80 divisors (see below), whose sum is σ = 258768180. Its totient is φ = 20528640.

The previous prime is 76985603. The next prime is 76985647. The reversal of 76985640 is 4658967.

It can be written as a sum of positive squares in 2 ways, for example, as 76842756 + 142884 = 8766^2 + 378^2 .

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

It is not an unprimeable number, because it can be changed into a prime (76985647) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8641 + ... + 15120.

Almost surely, 2^76985640 is an apocalyptic number.

It is an amenable number.

76985640 is an abundant number, since it is smaller than the sum of its proper divisors (181782540).

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

76985640 is a wasteful number, since it uses less digits than its factorization.

76985640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23784 (or 23771 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 76985640 is about 8774.1461123006. The cubic root of 76985640 is about 425.4056380934.

The spelling of 76985640 in words is "seventy-six million, nine hundred eighty-five thousand, six hundred forty".