631257878 has 16 divisors (see below), whose sum is σ = 974321136. Its totient is φ = 306602400.

The previous prime is 631257859. The next prime is 631257883. The reversal of 631257878 is 878752136.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 18776 + ... + 40187.

It is an arithmetic number, because the mean of its divisors is an integer number (60895071).

Almost surely, 2^631257878 is an apocalyptic number.

631257878 is a deficient number, since it is larger than the sum of its proper divisors (343063258).

631257878 is a wasteful number, since it uses less digits than its factorization.

631257878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59119.

The product of its digits is 564480, while the sum is 47.

The square root of 631257878 is about 25124.8458303728. The cubic root of 631257878 is about 857.8320543625.

The spelling of 631257878 in words is "six hundred thirty-one million, two hundred fifty-seven thousand, eight hundred seventy-eight".