642455902 has 16 divisors (see below), whose sum is σ = 1051719552. Its totient is φ = 291906520.

The previous prime is 642455893. The next prime is 642455921. The reversal of 642455902 is 209554246.

642455902 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 7 ways as a sum of consecutive naturals, for example, 72063 + ... + 80485.

It is an arithmetic number, because the mean of its divisors is an integer number (65732472).

Almost surely, 2^642455902 is an apocalyptic number.

642455902 is a deficient number, since it is larger than the sum of its proper divisors (409263650).

642455902 is a wasteful number, since it uses less digits than its factorization.

642455902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11903.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 642455902 is about 25346.7138303962. The cubic root of 642455902 is about 862.8747774611.

It can be divided in two parts, 6424 and 55902, that added together give a palindrome (62326).

The spelling of 642455902 in words is "six hundred forty-two million, four hundred fifty-five thousand, nine hundred two".