631992878 has 8 divisors (see below), whose sum is σ = 1034170200. Its totient is φ = 287269480.

The previous prime is 631992871. The next prime is 631992883. The reversal of 631992878 is 878299136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631992871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14363453 + ... + 14363496.

It is an arithmetic number, because the mean of its divisors is an integer number (129271275).

Almost surely, 2^631992878 is an apocalyptic number.

631992878 is a deficient number, since it is larger than the sum of its proper divisors (402177322).

631992878 is a wasteful number, since it uses less digits than its factorization.

631992878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28726962.

The product of its digits is 1306368, while the sum is 53.

The square root of 631992878 is about 25139.4685305796. The cubic root of 631992878 is about 858.1648618314.

The spelling of 631992878 in words is "six hundred thirty-one million, nine hundred ninety-two thousand, eight hundred seventy-eight".