31955990400 has 960 divisors, whose sum is σ = 125983186560. Its totient is φ = 7962624000.

The previous prime is 31955990399. The next prime is 31955990413. The reversal of 31955990400 is 409955913.

It is a happy number.

31955990400 is a `hidden beast` number, since 3 + 1 + 9 + 559 + 90 + 4 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 329443152 + ... + 329443248.

It is an arithmetic number, because the mean of its divisors is an integer number (131232486).

Almost surely, 2^31955990400 is an apocalyptic number.

31955990400 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 31955990400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62991593280).

31955990400 is an abundant number, since it is smaller than the sum of its proper divisors (94027196160).

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

31955990400 is a wasteful number, since it uses less digits than its factorization.

31955990400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The spelling of 31955990400 in words is "thirty-one billion, nine hundred fifty-five million, nine hundred ninety thousand, four hundred".