634867992 has 192 divisors, whose sum is σ = 2021254560. Its totient is φ = 177868800.

The previous prime is 634867969. The next prime is 634868021. The reversal of 634867992 is 299768436.

It is a happy number.

634867992 is a `hidden beast` number, since 6 + 3 + 486 + 79 + 92 = 666.

It is a super-2 number, since 2×634867992² = 806114734532224128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 820918 + ... + 821690.

Almost surely, 2^634867992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634867992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010627280).

634867992 is an abundant number, since it is smaller than the sum of its proper divisors (1386386568).

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

634867992 is a wasteful number, since it uses less digits than its factorization.

634867992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 867 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 634867992 is about 25196.5869117228. The cubic root of 634867992 is about 859.4642381416.

The spelling of 634867992 in words is "six hundred thirty-four million, eight hundred sixty-seven thousand, nine hundred ninety-two".