638407364035 has 48 divisors (see below), whose sum is σ = 963662603904. Its totient is φ = 403247781888.

The previous prime is 638407364027. The next prime is 638407364053. The reversal of 638407364035 is 530463704836.

It is not a de Polignac number, because 638407364035 - 2³ = 638407364027 is a prime.

It is a super-2 number, since 2×638407364035² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 638407364035.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1434874 + ... + 1826383.

It is an arithmetic number, because the mean of its divisors is an integer number (20076304248).

Almost surely, 2^638407364035 is an apocalyptic number.

638407364035 is a deficient number, since it is larger than the sum of its proper divisors (325255239869).

638407364035 is a wasteful number, since it uses less digits than its factorization.

638407364035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261340 (or 3261333 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 638407364035 in words is "six hundred thirty-eight billion, four hundred seven million, three hundred sixty-four thousand, thirty-five".