31120220328 has 16 divisors (see below), whose sum is σ = 77800550880. Its totient is φ = 10373406768.

The previous prime is 31120220323. The next prime is 31120220347. The reversal of 31120220328 is 82302202113.

It is a happy number.

It is a super-2 number, since 2×31120220328² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1296675847 = 31120220328 / (3 + 1 + 1 + 2 + 0 + 2 + 2 + 0 + 3 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 31120220298 and 31120220307.

It is not an unprimeable number, because it can be changed into a prime (31120220321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648337900 + ... + 648337947.

It is an arithmetic number, because the mean of its divisors is an integer number (4862534430).

Almost surely, 2^31120220328 is an apocalyptic number.

It is an amenable number.

31120220328 is an abundant number, since it is smaller than the sum of its proper divisors (46680330552).

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

31120220328 is a wasteful number, since it uses less digits than its factorization.

31120220328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296675856 (or 1296675852 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The spelling of 31120220328 in words is "thirty-one billion, one hundred twenty million, two hundred twenty thousand, three hundred twenty-eight".