76640015 has 8 divisors (see below), whose sum is σ = 96808560. Its totient is φ = 58084992.

The previous prime is 76639993. The next prime is 76640093. The reversal of 76640015 is 51004667.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 76640015 - 2¹² = 76635919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76640015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403274 + ... + 403463.

It is an arithmetic number, because the mean of its divisors is an integer number (12101070).

Almost surely, 2^76640015 is an apocalyptic number.

76640015 is a deficient number, since it is larger than the sum of its proper divisors (20168545).

76640015 is a wasteful number, since it uses less digits than its factorization.

76640015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806761.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 76640015 is about 8754.4283080050. The cubic root of 76640015 is about 424.7680672233.

The spelling of 76640015 in words is "seventy-six million, six hundred forty thousand, fifteen".