31334728518 has 12 divisors (see below), whose sum is σ = 67891911828. Its totient is φ = 10444909500.

The previous prime is 31334728517. The next prime is 31334728543. The reversal of 31334728518 is 81582743313.

31334728518 is a `hidden beast` number, since 3 + 13 + 347 + 285 + 18 = 666.

It is a super-2 number, since 2×31334728518² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31334728517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 870409108 + ... + 870409143.

It is an arithmetic number, because the mean of its divisors is an integer number (5657659319).

Almost surely, 2^31334728518 is an apocalyptic number.

31334728518 is an abundant number, since it is smaller than the sum of its proper divisors (36557183310).

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

31334728518 is a wasteful number, since it uses less digits than its factorization.

31334728518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740818259 (or 1740818256 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 31334728518 in words is "thirty-one billion, three hundred thirty-four million, seven hundred twenty-eight thousand, five hundred eighteen".