634212640 has 24 divisors (see below), whose sum is σ = 1498327740. Its totient is φ = 253684992.

The previous prime is 634212589. The next prime is 634212673. The reversal of 634212640 is 46212436.

It can be written as a sum of positive squares in 2 ways, for example, as 624800016 + 9412624 = 24996^2 + 3068^2 .

It is a junction number, because it is equal to n+sod(n) for n = 634212599 and 634212608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1981755 + ... + 1982074.

Almost surely, 2^634212640 is an apocalyptic number.

It is an amenable number.

634212640 is an abundant number, since it is smaller than the sum of its proper divisors (864115100).

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

634212640 is a wasteful number, since it uses less digits than its factorization.

634212640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963844 (or 3963836 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 634212640 is about 25183.5787766552. The cubic root of 634212640 is about 859.1684047117.

The spelling of 634212640 in words is "six hundred thirty-four million, two hundred twelve thousand, six hundred forty".