634551640 has 32 divisors (see below), whose sum is σ = 1449056880. Its totient is φ = 250031232.

The previous prime is 634551611. The next prime is 634551713. The reversal of 634551640 is 46155436.

It is a junction number, because it is equal to n+sod(n) for n = 634551596 and 634551605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115707 + ... + 121066.

Almost surely, 2^634551640 is an apocalyptic number.

It is an amenable number.

634551640 is an abundant number, since it is smaller than the sum of its proper divisors (814505240).

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

634551640 is a wasteful number, since it uses less digits than its factorization.

634551640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236851 (or 236847 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 634551640 is about 25190.3084538479. The cubic root of 634551640 is about 859.3214586412.

The spelling of 634551640 in words is "six hundred thirty-four million, five hundred fifty-one thousand, six hundred forty".