644262542 has 32 divisors (see below), whose sum is σ = 1206296064. Its totient is φ = 250711200.

The previous prime is 644262539. The next prime is 644262551. The reversal of 644262542 is 245262446.

644262542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161423 + ... + 165365.

It is an arithmetic number, because the mean of its divisors is an integer number (37696752).

Almost surely, 2^644262542 is an apocalyptic number.

644262542 is a deficient number, since it is larger than the sum of its proper divisors (562033522).

644262542 is a wasteful number, since it uses less digits than its factorization.

644262542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5024.

The product of its digits is 92160, while the sum is 35.

The square root of 644262542 is about 25382.3273558592. The cubic root of 644262542 is about 863.6828459501.

The spelling of 644262542 in words is "six hundred forty-four million, two hundred sixty-two thousand, five hundred forty-two".