31480900 has 36 divisors (see below), whose sum is σ = 74526480. Its totient is φ = 11447200.

The previous prime is 31480879. The next prime is 31480901. The reversal of 31480900 is 908413.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (31480901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13210 + ... + 15409.

It is an arithmetic number, because the mean of its divisors is an integer number (2070180).

Almost surely, 2^31480900 is an apocalyptic number.

It is an amenable number.

31480900 is an abundant number, since it is smaller than the sum of its proper divisors (43045580).

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

31480900 is a wasteful number, since it uses less digits than its factorization.

31480900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28644 (or 28637 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 31480900 is about 5610.7842589071. The cubic root of 31480900 is about 315.7541349832.

The spelling of 31480900 in words is "thirty-one million, four hundred eighty thousand, nine hundred".