31661982 has 64 divisors (see below), whose sum is σ = 77483520. Its totient is φ = 9504000.

The previous prime is 31661957. The next prime is 31661983. The reversal of 31661982 is 28916613.

31661982 is a `hidden beast` number, since 31 + 6 + 619 + 8 + 2 = 666.

It is a super-2 number, since 2×31661982² = 2004962208336648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89518 + ... + 89870.

It is an arithmetic number, because the mean of its divisors is an integer number (1210680).

Almost surely, 2^31661982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31661982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38741760).

31661982 is an abundant number, since it is smaller than the sum of its proper divisors (45821538).

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

31661982 is a wasteful number, since it uses less digits than its factorization.

31661982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 520 counting only the distinct ones).

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

The square root of 31661982 is about 5626.8980797594. The cubic root of 31661982 is about 316.3583967082.

The spelling of 31661982 in words is "thirty-one million, six hundred sixty-one thousand, nine hundred eighty-two".