31748487680 has 240 divisors, whose sum is σ = 95366474280. Its totient is φ = 10047356928.

The previous prime is 31748487679. The next prime is 31748487691. The reversal of 31748487680 is 8678484713.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17733716224 + 14014771456 = 133168^2 + 118384^2 .

It is a super-2 number, since 2×31748487680² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1620986 + ... + 1640454.

Almost surely, 2^31748487680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31748487680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47683237140).

31748487680 is an abundant number, since it is smaller than the sum of its proper divisors (63617986600).

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

31748487680 is a wasteful number, since it uses less digits than its factorization.

31748487680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19519 (or 19496 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 56.

The spelling of 31748487680 in words is "thirty-one billion, seven hundred forty-eight million, four hundred eighty-seven thousand, six hundred eighty".