634531830 has 16 divisors (see below), whose sum is σ = 1522876464. Its totient is φ = 169208480.

The previous prime is 634531829. The next prime is 634531831. The reversal of 634531830 is 38135436.

It is an interprime number because it is at equal distance from previous prime (634531829) and next prime (634531831).

It is a junction number, because it is equal to n+sod(n) for n = 634531791 and 634531800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634531831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10575501 + ... + 10575560.

It is an arithmetic number, because the mean of its divisors is an integer number (95179779).

Almost surely, 2^634531830 is an apocalyptic number.

634531830 is an abundant number, since it is smaller than the sum of its proper divisors (888344634).

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

634531830 is a wasteful number, since it uses less digits than its factorization.

634531830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21151071.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 634531830 is about 25189.9152440019. The cubic root of 634531830 is about 859.3125161931.

The spelling of 634531830 in words is "six hundred thirty-four million, five hundred thirty-one thousand, eight hundred thirty".