642258026 has 16 divisors (see below), whose sum is σ = 1058184000. Its totient is φ = 290999808.

The previous prime is 642258013. The next prime is 642258037. The reversal of 642258026 is 620852246.

It is a super-2 number, since 2×642258026² = 824990743922833352, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366551 + ... + 368298.

It is an arithmetic number, because the mean of its divisors is an integer number (66136500).

Almost surely, 2^642258026 is an apocalyptic number.

642258026 is a deficient number, since it is larger than the sum of its proper divisors (415925974).

642258026 is a wasteful number, since it uses less digits than its factorization.

642258026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734893.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 642258026 is about 25342.8101441020. The cubic root of 642258026 is about 862.7861800744.

The spelling of 642258026 in words is "six hundred forty-two million, two hundred fifty-eight thousand, twenty-six".