634425813 has 24 divisors (see below), whose sum is σ = 1092843648. Its totient is φ = 346766112.

The previous prime is 634425797. The next prime is 634425823. The reversal of 634425813 is 318524436.

634425813 is a `hidden beast` number, since 6 + 34 + 42 + 581 + 3 = 666.

It is not a de Polignac number, because 634425813 - 2⁴ = 634425797 is a prime.

It is a super-2 number, since 2×634425813² = 804992224401421938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634425823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217470 + ... + 220367.

It is an arithmetic number, because the mean of its divisors is an integer number (45535152).

Almost surely, 2^634425813 is an apocalyptic number.

634425813 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

634425813 is a deficient number, since it is larger than the sum of its proper divisors (458417835).

634425813 is a wasteful number, since it uses less digits than its factorization.

634425813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437873 (or 437870 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 634425813 is about 25187.8108020526. The cubic root of 634425813 is about 859.2646558101.

The spelling of 634425813 in words is "six hundred thirty-four million, four hundred twenty-five thousand, eight hundred thirteen".