631275978 has 16 divisors (see below), whose sum is σ = 1262814336. Its totient is φ = 210381600.

The previous prime is 631275949. The next prime is 631275989. The reversal of 631275978 is 879572136.

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 7 ways as a sum of consecutive naturals, for example, 35550 + ... + 50262.

It is an arithmetic number, because the mean of its divisors is an integer number (78925896).

Almost surely, 2^631275978 is an apocalyptic number.

631275978 is an abundant number, since it is smaller than the sum of its proper divisors (631538358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631275978 is a wasteful number, since it uses less digits than its factorization.

631275978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21869.

The product of its digits is 635040, while the sum is 48.

The square root of 631275978 is about 25125.2060290060. The cubic root of 631275978 is about 857.8402531311.

The spelling of 631275978 in words is "six hundred thirty-one million, two hundred seventy-five thousand, nine hundred seventy-eight".