634555440 has 60 divisors (see below), whose sum is σ = 2131051104. Its totient is φ = 169214592.

The previous prime is 634555421. The next prime is 634555451. The reversal of 634555440 is 44555436.

634555440 is a `hidden beast` number, since 63 + 4 + 5 + 554 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

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 = 634555395 and 634555404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439944 + ... + 441383.

Almost surely, 2^634555440 is an apocalyptic number.

634555440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

634555440 is an abundant number, since it is smaller than the sum of its proper divisors (1496495664).

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

634555440 is a wasteful number, since it uses less digits than its factorization.

634555440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881346 (or 881337 counting only the distinct ones).

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

The square root of 634555440 is about 25190.3838795680. The cubic root of 634555440 is about 859.3231739809.

The spelling of 634555440 in words is "six hundred thirty-four million, five hundred fifty-five thousand, four hundred forty".