634920064 has 16 divisors (see below), whose sum is σ = 1264880070. Its totient is φ = 317459968.

The previous prime is 634920053. The next prime is 634920071. The reversal of 634920064 is 460029436.

It can be written as a sum of positive squares in only one way, i.e., 325441600 + 309478464 = 18040^2 + 17592^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2480029 + ... + 2480284.

Almost surely, 2^634920064 is an apocalyptic number.

634920064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

634920064 is a deficient number, since it is larger than the sum of its proper divisors (629960006).

634920064 is an equidigital number, since it uses as much as digits as its factorization.

634920064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960327 (or 4960315 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 634920064 is about 25197.6202050908. The cubic root of 634920064 is about 859.4877353089.

The spelling of 634920064 in words is "six hundred thirty-four million, nine hundred twenty thousand, sixty-four".