31081228488 has 108 divisors (see below), whose sum is σ = 85582768635. Its totient is φ = 10190370528.

The previous prime is 31081228487. The next prime is 31081228513. The reversal of 31081228488 is 88482218013.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 15540614244 + 15540614244 = 124662^2 + 124662^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=124662.

It is a super-2 number, since 2×31081228488² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31081228483) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 118179445 + ... + 118179707.

Almost surely, 2^31081228488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31081228488

31081228488 is an abundant number, since it is smaller than the sum of its proper divisors (54501540147).

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

31081228488 is an equidigital number, since it uses as much as digits as its factorization.

31081228488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 45.

The spelling of 31081228488 in words is "thirty-one billion, eighty-one million, two hundred twenty-eight thousand, four hundred eighty-eight".