639954954 has 12 divisors (see below), whose sum is σ = 1386569106. Its totient is φ = 213318312.

The previous prime is 639954947. The next prime is 639954971. The reversal of 639954954 is 459459936.

639954954 is a `hidden beast` number, since 6 + 3 + 99 + 549 + 5 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 633679929 + 6275025 = 25173^2 + 2505^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 639954954.

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 5 ways as a sum of consecutive naturals, for example, 17776509 + ... + 17776544.

Almost surely, 2^639954954 is an apocalyptic number.

639954954 is an abundant number, since it is smaller than the sum of its proper divisors (746614152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639954954 is a wasteful number, since it uses less digits than its factorization.

639954954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35553061 (or 35553058 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 54.

The square root of 639954954 is about 25297.3309659339. The cubic root of 639954954 is about 861.7536570665.

The spelling of 639954954 in words is "six hundred thirty-nine million, nine hundred fifty-four thousand, nine hundred fifty-four".