634455540 has 72 divisors (see below), whose sum is σ = 1969295328. Its totient is φ = 165251520.

The previous prime is 634455463. The next prime is 634455553. The reversal of 634455540 is 45554436.

634455540 is a `hidden beast` number, since 63 + 4 + 4 + 55 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 634455495 and 634455504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33246 + ... + 48725.

It is an arithmetic number, because the mean of its divisors is an integer number (27351324).

Almost surely, 2^634455540 is an apocalyptic number.

634455540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

634455540 is an abundant number, since it is smaller than the sum of its proper divisors (1334839788).

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

634455540 is a wasteful number, since it uses less digits than its factorization.

634455540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82029 (or 82024 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The square root of 634455540 is about 25188.4009020025. The cubic root of 634455540 is about 859.2780763241.

The spelling of 634455540 in words is "six hundred thirty-four million, four hundred fifty-five thousand, five hundred forty".