31488660 has 144 divisors (see below), whose sum is σ = 111086976. Its totient is φ = 7070976.

The previous prime is 31488647. The next prime is 31488733. The reversal of 31488660 is 6688413.

It is a happy number.

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, 84234 + ... + 84606.

Almost surely, 2^31488660 is an apocalyptic number.

31488660 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 31488660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55543488).

31488660 is an abundant number, since it is smaller than the sum of its proper divisors (79598316).

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

31488660 is a wasteful number, since it uses less digits than its factorization.

31488660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 31488660 is about 5611.4757417278. The cubic root of 31488660 is about 315.7800771765.

The spelling of 31488660 in words is "thirty-one million, four hundred eighty-eight thousand, six hundred sixty".