634978775 has 12 divisors (see below), whose sum is σ = 788020992. Its totient is φ = 507565440.

The previous prime is 634978769. The next prime is 634978787. The reversal of 634978775 is 577879436.

634978775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 634978775 - 2⁶ = 634978711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634978775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22634 + ... + 42216.

It is an arithmetic number, because the mean of its divisors is an integer number (65668416).

Almost surely, 2^634978775 is an apocalyptic number.

634978775 is a deficient number, since it is larger than the sum of its proper divisors (153042217).

634978775 is a wasteful number, since it uses less digits than its factorization.

634978775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20890 (or 20885 counting only the distinct ones).

The product of its digits is 8890560, while the sum is 56.

The square root of 634978775 is about 25198.7851889729. The cubic root of 634978775 is about 859.5142267430.

The spelling of 634978775 in words is "six hundred thirty-four million, nine hundred seventy-eight thousand, seven hundred seventy-five".