31485690 has 24 divisors (see below), whose sum is σ = 81863028. Its totient is φ = 8396160.

The previous prime is 31485661. The next prime is 31485721. The reversal of 31485690 is 9658413.

It can be written as a sum of positive squares in 2 ways, for example, as 30569841 + 915849 = 5529^2 + 957^2 .

It is a super-3 number, since 3×31485690³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174831 + ... + 175010.

Almost surely, 2^31485690 is an apocalyptic number.

31485690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31485690 is an abundant number, since it is smaller than the sum of its proper divisors (50377338).

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

31485690 is a wasteful number, since it uses less digits than its factorization.

31485690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349854 (or 349851 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 31485690 is about 5611.2110992191. The cubic root of 31485690 is about 315.7701487736.

The spelling of 31485690 in words is "thirty-one million, four hundred eighty-five thousand, six hundred ninety".