31028616 has 32 divisors (see below), whose sum is σ = 86191200. Its totient is φ = 10342800.

The previous prime is 31028611. The next prime is 31028617. The reversal of 31028616 is 61682013.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31028616.

It is not an unprimeable number, because it can be changed into a prime (31028611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71610 + ... + 72041.

It is an arithmetic number, because the mean of its divisors is an integer number (2693475).

Almost surely, 2^31028616 is an apocalyptic number.

31028616 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31028616 is an abundant number, since it is smaller than the sum of its proper divisors (55162584).

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

31028616 is a wasteful number, since it uses less digits than its factorization.

31028616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143666 (or 143656 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 31028616 is about 5570.3335627232. Note that the first 3 decimals coincide. The cubic root of 31028616 is about 314.2346954571.

The spelling of 31028616 in words is "thirty-one million, twenty-eight thousand, six hundred sixteen".