31413728 has 24 divisors (see below), whose sum is σ = 63980280. Its totient is φ = 15164800.

The previous prime is 31413713. The next prime is 31413743. The reversal of 31413728 is 82731413.

It is an interprime number because it is at equal distance from previous prime (31413713) and next prime (31413743).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 31413728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15998 + ... + 17853.

It is an arithmetic number, because the mean of its divisors is an integer number (2665845).

Almost surely, 2^31413728 is an apocalyptic number.

It is an amenable number.

31413728 is an abundant number, since it is smaller than the sum of its proper divisors (32566552).

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

31413728 is a wasteful number, since it uses less digits than its factorization.

31413728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33890 (or 33882 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 31413728 is about 5604.7950899208. The cubic root of 31413728 is about 315.5293961725.

The spelling of 31413728 in words is "thirty-one million, four hundred thirteen thousand, seven hundred twenty-eight".