642577388 has 6 divisors (see below), whose sum is σ = 1124510436. Its totient is φ = 321288692.

The previous prime is 642577367. The next prime is 642577391. The reversal of 642577388 is 883775246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80322170 + ... + 80322177.

It is an arithmetic number, because the mean of its divisors is an integer number (187418406).

Almost surely, 2^642577388 is an apocalyptic number.

It is an amenable number.

642577388 is a deficient number, since it is larger than the sum of its proper divisors (481933048).

642577388 is a wasteful number, since it uses less digits than its factorization.

642577388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160644351 (or 160644349 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 50.

The square root of 642577388 is about 25349.1102013463. The cubic root of 642577388 is about 862.9291628272.

The spelling of 642577388 in words is "six hundred forty-two million, five hundred seventy-seven thousand, three hundred eighty-eight".