31404400828 has 12 divisors (see below), whose sum is σ = 56730530752. Its totient is φ = 15195677760.

The previous prime is 31404400801. The next prime is 31404400843. The reversal of 31404400828 is 82800440413.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31404400793 and 31404400802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126630525 + ... + 126630772.

Almost surely, 2^31404400828 is an apocalyptic number.

It is an amenable number.

31404400828 is a deficient number, since it is larger than the sum of its proper divisors (25326129924).

31404400828 is a wasteful number, since it uses less digits than its factorization.

31404400828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253261332 (or 253261330 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The spelling of 31404400828 in words is "thirty-one billion, four hundred four million, four hundred thousand, eight hundred twenty-eight".