31444252728 has 32 divisors (see below), whose sum is σ = 89840722560. Its totient is φ = 8984072160.

The previous prime is 31444252727. The next prime is 31444252769. The reversal of 31444252728 is 82725244413.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 31444252728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31444252727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93583918 + ... + 93584253.

It is an arithmetic number, because the mean of its divisors is an integer number (2807522580).

Almost surely, 2^31444252728 is an apocalyptic number.

It is an amenable number.

31444252728 is an abundant number, since it is smaller than the sum of its proper divisors (58396469832).

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

31444252728 is a wasteful number, since it uses less digits than its factorization.

31444252728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187168187 (or 187168183 counting only the distinct ones).

The product of its digits is 430080, while the sum is 42.

The spelling of 31444252728 in words is "thirty-one billion, four hundred forty-four million, two hundred fifty-two thousand, seven hundred twenty-eight".