76615640 has 64 divisors (see below), whose sum is σ = 178536960. Its totient is φ = 29572480.

The previous prime is 76615631. The next prime is 76615661. The reversal of 76615640 is 4651667.

It is a self number, because there is not a number n which added to its sum of digits gives 76615640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155795 + ... + 156285.

It is an arithmetic number, because the mean of its divisors is an integer number (2789640).

Almost surely, 2^76615640 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 76615640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89268480).

76615640 is an abundant number, since it is smaller than the sum of its proper divisors (101921320).

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

76615640 is a wasteful number, since it uses less digits than its factorization.

76615640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 76615640 is about 8753.0360447104. The cubic root of 76615640 is about 424.7230306130.

The spelling of 76615640 in words is "seventy-six million, six hundred fifteen thousand, six hundred forty".