81970248 has 16 divisors (see below), whose sum is σ = 204925680. Its totient is φ = 27323408.

The previous prime is 81970247. The next prime is 81970249. The reversal of 81970248 is 84207918.

It is an interprime number because it is at equal distance from previous prime (81970247) and next prime (81970249).

It is not an unprimeable number, because it can be changed into a prime (81970241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1707690 + ... + 1707737.

It is an arithmetic number, because the mean of its divisors is an integer number (12807855).

Almost surely, 2^81970248 is an apocalyptic number.

It is an amenable number.

81970248 is an abundant number, since it is smaller than the sum of its proper divisors (122955432).

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

81970248 is a wasteful number, since it uses less digits than its factorization.

81970248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415436 (or 3415432 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 81970248 is about 9053.7422097164. The cubic root of 81970248 is about 434.3955987195.

Subtracting 81970248 from its reverse (84207918), we obtain a triangular number (2237670 = T₂₁₁₅).

The spelling of 81970248 in words is "eighty-one million, nine hundred seventy thousand, two hundred forty-eight".