31357980 has 144 divisors (see below), whose sum is σ = 102604320. Its totient is φ = 7727616.

The previous prime is 31357967. The next prime is 31358009. The reversal of 31357980 is 8975313.

31357980 is a `hidden beast` number, since 3 + 1 + 3 + 579 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 181174 + ... + 181346.

It is an arithmetic number, because the mean of its divisors is an integer number (712530).

Almost surely, 2^31357980 is an apocalyptic number.

31357980 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31357980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51302160).

31357980 is an abundant number, since it is smaller than the sum of its proper divisors (71246340).

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

31357980 is a wasteful number, since it uses less digits than its factorization.

31357980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 31357980 is about 5599.8196399527. The cubic root of 31357980 is about 315.3426354838.

The spelling of 31357980 in words is "thirty-one million, three hundred fifty-seven thousand, nine hundred eighty".