577981887 has 16 divisors (see below), whose sum is σ = 909146112. Its totient is φ = 319620960.

The previous prime is 577981787. The next prime is 577981909. The reversal of 577981887 is 788189775.

It is a happy number.

It is not a de Polignac number, because 577981887 - 2¹² = 577977791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 577981887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (577981787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443268 + ... + 444569.

It is an arithmetic number, because the mean of its divisors is an integer number (56821632).

Almost surely, 2^577981887 is an apocalyptic number.

577981887 is a deficient number, since it is larger than the sum of its proper divisors (331164225).

577981887 is a wasteful number, since it uses less digits than its factorization.

577981887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887878.

The product of its digits is 7902720, while the sum is 60.

The square root of 577981887 is about 24041.2538566523. The cubic root of 577981887 is about 832.9867171642.

It can be divided in two parts, 57798 and 1887, that added together give a triangular number (59685 = T₃₄₅).

The spelling of 577981887 in words is "five hundred seventy-seven million, nine hundred eighty-one thousand, eight hundred eighty-seven".