642387874 has 16 divisors (see below), whose sum is σ = 1055446200. Its totient is φ = 291875584.

The previous prime is 642387841. The next prime is 642387887. The reversal of 642387874 is 478783246.

It can be written as a sum of positive squares in 4 ways, for example, as 634687249 + 7700625 = 25193^2 + 2775^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324769 + ... + 326740.

Almost surely, 2^642387874 is an apocalyptic number.

642387874 is a deficient number, since it is larger than the sum of its proper divisors (413058326).

642387874 is a wasteful number, since it uses less digits than its factorization.

642387874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651557.

The product of its digits is 1806336, while the sum is 49.

The square root of 642387874 is about 25345.3718457631. The cubic root of 642387874 is about 862.8443205238.

The spelling of 642387874 in words is "six hundred forty-two million, three hundred eighty-seven thousand, eight hundred seventy-four".