642538718 has 16 divisors (see below), whose sum is σ = 1008014976. Its totient is φ = 306597720.

The previous prime is 642538717. The next prime is 642538727. The reversal of 642538718 is 817835246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642538717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4613 + ... + 36143.

It is an arithmetic number, because the mean of its divisors is an integer number (63000936).

Almost surely, 2^642538718 is an apocalyptic number.

642538718 is a deficient number, since it is larger than the sum of its proper divisors (365476258).

642538718 is a wasteful number, since it uses less digits than its factorization.

642538718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31999.

The product of its digits is 322560, while the sum is 44.

The square root of 642538718 is about 25348.3474412041. The cubic root of 642538718 is about 862.9118522585.

The spelling of 642538718 in words is "six hundred forty-two million, five hundred thirty-eight thousand, seven hundred eighteen".