31550680 has 64 divisors (see below), whose sum is σ = 81622080. Its totient is φ = 10752000.

The previous prime is 31550671. The next prime is 31550681. The reversal of 31550680 is 8605513.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31550681) 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 15 ways as a sum of consecutive naturals, for example, 78480 + ... + 78880.

It is an arithmetic number, because the mean of its divisors is an integer number (1275345).

Almost surely, 2^31550680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31550680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40811040).

31550680 is an abundant number, since it is smaller than the sum of its proper divisors (50071400).

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

31550680 is a wasteful number, since it uses less digits than its factorization.

31550680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 31550680 is about 5616.9991988605. Note that the first 3 decimals coincide. The cubic root of 31550680 is about 315.9872611433.

The spelling of 31550680 in words is "thirty-one million, five hundred fifty thousand, six hundred eighty".