634406984 has 8 divisors (see below), whose sum is σ = 1189513110. Its totient is φ = 317203488.

The previous prime is 634406977. The next prime is 634406989. The reversal of 634406984 is 489604436.

It can be written as a sum of positive squares in only one way, i.e., 451562500 + 182844484 = 21250^2 + 13522^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (634406989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39650429 + ... + 39650444.

Almost surely, 2^634406984 is an apocalyptic number.

It is an amenable number.

634406984 is a deficient number, since it is larger than the sum of its proper divisors (555106126).

634406984 is a wasteful number, since it uses less digits than its factorization.

634406984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79300879 (or 79300875 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The square root of 634406984 is about 25187.4370272166. The cubic root of 634406984 is about 859.2561550766.

The spelling of 634406984 in words is "six hundred thirty-four million, four hundred six thousand, nine hundred eighty-four".