31190264728 has 32 divisors (see below), whose sum is σ = 66923287200. Its totient is φ = 13349855232.

The previous prime is 31190264711. The next prime is 31190264761. The reversal of 31190264728 is 82746209113.

It is a super-2 number, since 2×31190264728² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319075 + ... + 405202.

It is an arithmetic number, because the mean of its divisors is an integer number (2091352725).

Almost surely, 2^31190264728 is an apocalyptic number.

It is an amenable number.

31190264728 is an abundant number, since it is smaller than the sum of its proper divisors (35733022472).

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

31190264728 is a wasteful number, since it uses less digits than its factorization.

31190264728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725059 (or 725055 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 31190264728 in words is "thirty-one billion, one hundred ninety million, two hundred sixty-four thousand, seven hundred twenty-eight".