634097988 has 36 divisors (see below), whose sum is σ = 1604758428. Its totient is φ = 211115520.

The previous prime is 634097969. The next prime is 634097993. The reversal of 634097988 is 889790436.

It can be written as a sum of positive squares in 2 ways, for example, as 235376964 + 398721024 = 15342^2 + 19968^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21720 + ... + 41712.

It is an arithmetic number, because the mean of its divisors is an integer number (44576623).

Almost surely, 2^634097988 is an apocalyptic number.

It is an amenable number.

634097988 is an abundant number, since it is smaller than the sum of its proper divisors (970660440).

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

634097988 is a wasteful number, since it uses less digits than its factorization.

634097988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20884 (or 20879 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 634097988 is about 25181.3023491638. The cubic root of 634097988 is about 859.1166285374.

The spelling of 634097988 in words is "six hundred thirty-four million, ninety-seven thousand, nine hundred eighty-eight".