77031087 has 24 divisors (see below), whose sum is σ = 122400432. Its totient is φ = 42940800.

The previous prime is 77031079. The next prime is 77031089. The reversal of 77031087 is 78013077.

It is not a de Polignac number, because 77031087 - 2³ = 77031079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77031089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 364 + ... + 12417.

It is an arithmetic number, because the mean of its divisors is an integer number (5100018).

Almost surely, 2^77031087 is an apocalyptic number.

77031087 is a deficient number, since it is larger than the sum of its proper divisors (45369345).

77031087 is a wasteful number, since it uses less digits than its factorization.

77031087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12839 (or 12832 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 77031087 is about 8776.7355548632. The cubic root of 77031087 is about 425.4893316537.

The spelling of 77031087 in words is "seventy-seven million, thirty-one thousand, eighty-seven".