76985557 has 4 divisors (see below), whose sum is σ = 83984256. Its totient is φ = 69986860.

The previous prime is 76985539. The next prime is 76985563. The reversal of 76985557 is 75558967.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 76985557 - 2²³ = 68596949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76985507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3499333 + ... + 3499354.

It is an arithmetic number, because the mean of its divisors is an integer number (20996064).

Almost surely, 2^76985557 is an apocalyptic number.

It is an amenable number.

76985557 is a deficient number, since it is larger than the sum of its proper divisors (6998699).

76985557 is a wasteful number, since it uses less digits than its factorization.

76985557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6998698.

The product of its digits is 2646000, while the sum is 52.

The square root of 76985557 is about 8774.1413824944. The cubic root of 76985557 is about 425.4054852135.

The spelling of 76985557 in words is "seventy-six million, nine hundred eighty-five thousand, five hundred fifty-seven".