31022400402 has 48 divisors (see below), whose sum is σ = 77522153280. Its totient is φ = 8782222176.

The previous prime is 31022400389. The next prime is 31022400481. The reversal of 31022400402 is 20400422013.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1115668 + ... + 1143135.

It is an arithmetic number, because the mean of its divisors is an integer number (1615044860).

Almost surely, 2^31022400402 is an apocalyptic number.

31022400402 is an abundant number, since it is smaller than the sum of its proper divisors (46499752878).

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

31022400402 is a wasteful number, since it uses less digits than its factorization.

31022400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258927 (or 2258924 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 31022400402 its reverse (20400422013), we get a palindrome (51422822415).

The spelling of 31022400402 in words is "thirty-one billion, twenty-two million, four hundred thousand, four hundred two".