31428398865 has 24 divisors (see below), whose sum is σ = 53417410560. Its totient is φ = 15775821568.

The previous prime is 31428398863. The next prime is 31428398867. The reversal of 31428398865 is 56889382413.

It is an interprime number because it is at equal distance from previous prime (31428398863) and next prime (31428398867).

It is not a de Polignac number, because 31428398865 - 2¹ = 31428398863 is a prime.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (31428398863) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3620625 + ... + 3629294.

It is an arithmetic number, because the mean of its divisors is an integer number (2225725440).

Almost surely, 2^31428398865 is an apocalyptic number.

It is an amenable number.

31428398865 is a deficient number, since it is larger than the sum of its proper divisors (21989011695).

31428398865 is a wasteful number, since it uses less digits than its factorization.

31428398865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7249961 (or 7249944 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 57.

The spelling of 31428398865 in words is "thirty-one billion, four hundred twenty-eight million, three hundred ninety-eight thousand, eight hundred sixty-five".