31339064520 has 96 divisors (see below), whose sum is σ = 102214752120. Its totient is φ = 8327316480.

The previous prime is 31339064447. The next prime is 31339064521. The reversal of 31339064520 is 2546093313.

It is a happy number.

31339064520 is a `hidden beast` number, since 3 + 1 + 3 + 3 + 9 + 0 + 645 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16856867556 + 14482196964 = 129834^2 + 120342^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (31339064521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53739 + ... + 256058.

Almost surely, 2^31339064520 is an apocalyptic number.

31339064520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31339064520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51107376060).

31339064520 is an abundant number, since it is smaller than the sum of its proper divisors (70875687600).

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

31339064520 is a wasteful number, since it uses less digits than its factorization.

31339064520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310095 (or 310088 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The spelling of 31339064520 in words is "thirty-one billion, three hundred thirty-nine million, sixty-four thousand, five hundred twenty".