642254977 has 16 divisors (see below), whose sum is σ = 791949312. Its totient is φ = 507205440.

The previous prime is 642254933. The next prime is 642254989. The reversal of 642254977 is 779452246.

It is a happy number.

It is not a de Polignac number, because 642254977 - 2¹¹ = 642252929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642254077) 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, 44352 + ... + 57022.

It is an arithmetic number, because the mean of its divisors is an integer number (49496832).

Almost surely, 2^642254977 is an apocalyptic number.

It is an amenable number.

642254977 is a deficient number, since it is larger than the sum of its proper divisors (149694335).

642254977 is a wasteful number, since it uses less digits than its factorization.

642254977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13248.

The product of its digits is 846720, while the sum is 46.

The square root of 642254977 is about 25342.7499889022. The cubic root of 642254977 is about 862.7848147668.

The spelling of 642254977 in words is "six hundred forty-two million, two hundred fifty-four thousand, nine hundred seventy-seven".