634709994 has 32 divisors (see below), whose sum is σ = 1357969536. Its totient is φ = 197068800.

The previous prime is 634709993. The next prime is 634710017. The reversal of 634709994 is 499907436.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (634709993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22182 + ... + 41969.

It is an arithmetic number, because the mean of its divisors is an integer number (42436548).

Almost surely, 2^634709994 is an apocalyptic number.

634709994 is an abundant number, since it is smaller than the sum of its proper divisors (723259542).

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

634709994 is a wasteful number, since it uses less digits than its factorization.

634709994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64270.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 634709994 is about 25193.4514110314. The cubic root of 634709994 is about 859.3929346587.

The spelling of 634709994 in words is "six hundred thirty-four million, seven hundred nine thousand, nine hundred ninety-four".