31723668 has 36 divisors (see below), whose sum is σ = 82150068. Its totient is φ = 10316160.

The previous prime is 31723663. The next prime is 31723669. The reversal of 31723668 is 86632713.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2108304 + 29615364 = 1452^2 + 5442^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31723668² = 2012782222748448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31723661) 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, 9271 + ... + 12222.

Almost surely, 2^31723668 is an apocalyptic number.

It is an amenable number.

31723668 is an abundant number, since it is smaller than the sum of its proper divisors (50426400).

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

31723668 is a wasteful number, since it uses less digits than its factorization.

31723668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21544 (or 21539 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 31723668 is about 5632.3767629661. The cubic root of 31723668 is about 316.5637136543.

The spelling of 31723668 in words is "thirty-one million, seven hundred twenty-three thousand, six hundred sixty-eight".