77531057 has 4 divisors (see below), whose sum is σ = 77621760. Its totient is φ = 77440356.

The previous prime is 77531053. The next prime is 77531071. The reversal of 77531057 is 75013577.

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 77531057 - 2² = 77531053 is a prime.

It is a super-2 number, since 2×77531057² = 12022129599074498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77531053) 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, 44057 + ... + 45782.

It is an arithmetic number, because the mean of its divisors is an integer number (19405440).

Almost surely, 2^77531057 is an apocalyptic number.

It is an amenable number.

77531057 is a deficient number, since it is larger than the sum of its proper divisors (90703).

77531057 is an equidigital number, since it uses as much as digits as its factorization.

77531057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90702.

The product of its (nonzero) digits is 25725, while the sum is 35.

The square root of 77531057 is about 8805.1721732173. The cubic root of 77531057 is about 426.4078928763.

The spelling of 77531057 in words is "seventy-seven million, five hundred thirty-one thousand, fifty-seven".