76728591 has 12 divisors (see below), whose sum is σ = 112076640. Its totient is φ = 50577120.

The previous prime is 76728583. The next prime is 76728607. The reversal of 76728591 is 19582767.

It is not a de Polignac number, because 76728591 - 2³ = 76728583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76728521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47095 + ... + 48696.

It is an arithmetic number, because the mean of its divisors is an integer number (9339720).

Almost surely, 2^76728591 is an apocalyptic number.

76728591 is a deficient number, since it is larger than the sum of its proper divisors (35348049).

76728591 is a wasteful number, since it uses less digits than its factorization.

76728591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95886 (or 95883 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 76728591 is about 8759.4857725782. The cubic root of 76728591 is about 424.9316448313.

It can be divided in two parts, 767285 and 91, that added together give a square (767376 = 876²).

The spelling of 76728591 in words is "seventy-six million, seven hundred twenty-eight thousand, five hundred ninety-one".