631078978 has 8 divisors (see below), whose sum is σ = 947214540. Its totient is φ = 315340800.

The previous prime is 631078967. The next prime is 631079021. The reversal of 631078978 is 879870136.

It can be written as a sum of positive squares in 2 ways, for example, as 554743809 + 76335169 = 23553^2 + 8737^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 95343 + ... + 101746.

Almost surely, 2^631078978 is an apocalyptic number.

631078978 is a deficient number, since it is larger than the sum of its proper divisors (316135562).

631078978 is a wasteful number, since it uses less digits than its factorization.

631078978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198692.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 631078978 is about 25121.2853572424. The cubic root of 631078978 is about 857.7510094839.

The spelling of 631078978 in words is "six hundred thirty-one million, seventy-eight thousand, nine hundred seventy-eight".