631423278 has 48 divisors (see below), whose sum is σ = 1466184096. Its totient is φ = 195877440.

The previous prime is 631423277. The next prime is 631423297. The reversal of 631423278 is 872324136.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631423277) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5293 + ... + 35928.

It is an arithmetic number, because the mean of its divisors is an integer number (30545502).

Almost surely, 2^631423278 is an apocalyptic number.

631423278 is an abundant number, since it is smaller than the sum of its proper divisors (834760818).

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

631423278 is a wasteful number, since it uses less digits than its factorization.

631423278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41289 (or 41286 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 631423278 is about 25128.1371772760. The cubic root of 631423278 is about 857.9069698798.

It can be divided in two parts, 6314 and 23278, that added together give a palindrome (29592).

The spelling of 631423278 in words is "six hundred thirty-one million, four hundred twenty-three thousand, two hundred seventy-eight".