77331057 has 4 divisors (see below), whose sum is σ = 103108080. Its totient is φ = 51554036.

The previous prime is 77331049. The next prime is 77331091. The reversal of 77331057 is 75013377.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75013377 = 3 ⋅25004459.

It is a cyclic number.

It is not a de Polignac number, because 77331057 - 2³ = 77331049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77331257) 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, 12888507 + ... + 12888512.

It is an arithmetic number, because the mean of its divisors is an integer number (25777020).

Almost surely, 2^77331057 is an apocalyptic number.

It is an amenable number.

77331057 is a deficient number, since it is larger than the sum of its proper divisors (25777023).

77331057 is a wasteful number, since it uses less digits than its factorization.

77331057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25777022.

The product of its (nonzero) digits is 15435, while the sum is 33.

The square root of 77331057 is about 8793.8078782743. The cubic root of 77331057 is about 426.0409215908.

The spelling of 77331057 in words is "seventy-seven million, three hundred thirty-one thousand, fifty-seven".