639954162 has 128 divisors (see below), whose sum is σ = 1598054400. Its totient is φ = 188863488.

The previous prime is 639954149. The next prime is 639954163. The reversal of 639954162 is 261459936.

639954162 is a `hidden beast` number, since 639 + 9 + 5 + 4 + 1 + 6 + 2 = 666.

639954162 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×639954162² = 819082658922244488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639954163) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1108818 + ... + 1109394.

It is an arithmetic number, because the mean of its divisors is an integer number (12484800).

Almost surely, 2^639954162 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639954162, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (799027200).

639954162 is an abundant number, since it is smaller than the sum of its proper divisors (958100238).

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

639954162 is a wasteful number, since it uses less digits than its factorization.

639954162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 671 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 639954162 is about 25297.3153121038. The cubic root of 639954162 is about 861.7533015679.

The spelling of 639954162 in words is "six hundred thirty-nine million, nine hundred fifty-four thousand, one hundred sixty-two".