31821696 has 96 divisors (see below), whose sum is σ = 95631120. Its totient is φ = 10137600.

The previous prime is 31821689. The next prime is 31821701. The reversal of 31821696 is 69612813.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31821696.

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, 25896 + ... + 27096.

Almost surely, 2^31821696 is an apocalyptic number.

31821696 is a gapful number since it is divisible by the number (36) 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 31821696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47815560).

31821696 is an abundant number, since it is smaller than the sum of its proper divisors (63809424).

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

31821696 is a wasteful number, since it uses less digits than its factorization.

31821696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1229 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 31821696 is about 5641.0722385022. The cubic root of 31821696 is about 316.8894452059.

The spelling of 31821696 in words is "thirty-one million, eight hundred twenty-one thousand, six hundred ninety-six".