634621086 has 48 divisors (see below), whose sum is σ = 1516909680. Its totient is φ = 190143360.

The previous prime is 634621079. The next prime is 634621087. The reversal of 634621086 is 680126436.

634621086 is a `hidden beast` number, since 634 + 6 + 2 + 10 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 634621086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634621087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 385 + ... + 35628.

It is an arithmetic number, because the mean of its divisors is an integer number (31602285).

Almost surely, 2^634621086 is an apocalyptic number.

634621086 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 634621086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758454840).

634621086 is an abundant number, since it is smaller than the sum of its proper divisors (882288594).

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

634621086 is a wasteful number, since it uses less digits than its factorization.

634621086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36121 (or 36118 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 634621086 is about 25191.6868430838. The cubic root of 634621086 is about 859.3528058462.

The spelling of 634621086 in words is "six hundred thirty-four million, six hundred twenty-one thousand, eighty-six".