31128489384 has 32 divisors (see below), whose sum is σ = 78011520000. Its totient is φ = 10350790272.

The previous prime is 31128489383. The next prime is 31128489397. The reversal of 31128489384 is 48398482113.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31128489383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1575784 + ... + 1595415.

It is an arithmetic number, because the mean of its divisors is an integer number (2437860000).

Almost surely, 2^31128489384 is an apocalyptic number.

It is an amenable number.

31128489384 is an abundant number, since it is smaller than the sum of its proper divisors (46883030616).

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

31128489384 is a wasteful number, since it uses less digits than its factorization.

31128489384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171617 (or 3171613 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The spelling of 31128489384 in words is "thirty-one billion, one hundred twenty-eight million, four hundred eighty-nine thousand, three hundred eighty-four".