639577077 has 32 divisors (see below), whose sum is σ = 946702080. Its totient is φ = 382018560.

The previous prime is 639577063. The next prime is 639577093. The reversal of 639577077 is 770775936.

It is not a de Polignac number, because 639577077 - 2¹⁸ = 639314933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639577097) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267427 + ... + 269807.

It is an arithmetic number, because the mean of its divisors is an integer number (29584440).

Almost surely, 2^639577077 is an apocalyptic number.

It is an amenable number.

639577077 is a deficient number, since it is larger than the sum of its proper divisors (307125003).

639577077 is a wasteful number, since it uses less digits than its factorization.

639577077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653.

The product of its (nonzero) digits is 1944810, while the sum is 51.

The square root of 639577077 is about 25289.8611502713. The cubic root of 639577077 is about 861.5840091879.

The spelling of 639577077 in words is "six hundred thirty-nine million, five hundred seventy-seven thousand, seventy-seven".