31006690 has 32 divisors (see below), whose sum is σ = 65572416. Its totient is φ = 10407360.

The previous prime is 31006681. The next prime is 31006747. The reversal of 31006690 is 9660013.

It is a super-2 number, since 2×31006690² = 1922829649512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9412 + ... + 12271.

It is an arithmetic number, because the mean of its divisors is an integer number (2049138).

Almost surely, 2^31006690 is an apocalyptic number.

31006690 is an abundant number, since it is smaller than the sum of its proper divisors (34565726).

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

31006690 is a wasteful number, since it uses less digits than its factorization.

31006690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21714.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 31006690 is about 5568.3651101558. The cubic root of 31006690 is about 314.1606612875.

The spelling of 31006690 in words is "thirty-one million, six thousand, six hundred ninety".