76728577 has 8 divisors (see below), whose sum is σ = 80873640. Its totient is φ = 72683520.

The previous prime is 76728563. The next prime is 76728583. The reversal of 76728577 is 77582767.

It can be written as a sum of positive squares in 4 ways, for example, as 34621456 + 42107121 = 5884^2 + 6489^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76728577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76728577.

It is not an unprimeable number, because it can be changed into a prime (76728557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23424 + ... + 26497.

It is an arithmetic number, because the mean of its divisors is an integer number (10109205).

Almost surely, 2^76728577 is an apocalyptic number.

It is an amenable number.

76728577 is a deficient number, since it is larger than the sum of its proper divisors (4145063).

76728577 is a wasteful number, since it uses less digits than its factorization.

76728577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50003.

The product of its digits is 1152480, while the sum is 49.

The square root of 76728577 is about 8759.4849734445. The cubic root of 76728577 is about 424.9316189868.

The spelling of 76728577 in words is "seventy-six million, seven hundred twenty-eight thousand, five hundred seventy-seven".