31697879040 has 600 divisors, whose sum is σ = 120752161992. Its totient is φ = 7927234560.

The previous prime is 31697879039. The next prime is 31697879069. The reversal of 31697879040 is 4097879613.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8923447296 + 22774431744 = 94464^2 + 150912^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 112803700 + ... + 112803980.

Almost surely, 2^31697879040 is an apocalyptic number.

31697879040 is a gapful number since it is divisible by the number (30) 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 31697879040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60376080996).

31697879040 is an abundant number, since it is smaller than the sum of its proper divisors (89054282952).

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

31697879040 is an equidigital number, since it uses as much as digits as its factorization.

31697879040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 31697879040 in words is "thirty-one billion, six hundred ninety-seven million, eight hundred seventy-nine thousand, forty".