634138635 has 64 divisors (see below), whose sum is σ = 1177214976. Its totient is φ = 288921600.

The previous prime is 634138627. The next prime is 634138649. The reversal of 634138635 is 536831436.

It is not a de Polignac number, because 634138635 - 2³ = 634138627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 634138593 and 634138602.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 136755 + ... + 141315.

It is an arithmetic number, because the mean of its divisors is an integer number (18393984).

Almost surely, 2^634138635 is an apocalyptic number.

634138635 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

634138635 is a deficient number, since it is larger than the sum of its proper divisors (543076341).

634138635 is a wasteful number, since it uses less digits than its factorization.

634138635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636.

The product of its digits is 155520, while the sum is 39.

The square root of 634138635 is about 25182.1094231599. The cubic root of 634138635 is about 859.1349851995.

The spelling of 634138635 in words is "six hundred thirty-four million, one hundred thirty-eight thousand, six hundred thirty-five".