81660248 has 32 divisors (see below), whose sum is σ = 164883600. Its totient is φ = 37773312.

The previous prime is 81660223. The next prime is 81660263. The reversal of 81660248 is 84206618.

It is a super-2 number, since 2×81660248² = 13336792206843008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2936 + ... + 13112.

Almost surely, 2^81660248 is an apocalyptic number.

It is an amenable number.

81660248 is an abundant number, since it is smaller than the sum of its proper divisors (83223352).

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

81660248 is a wasteful number, since it uses less digits than its factorization.

81660248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10259 (or 10255 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 81660248 is about 9036.6060000423. The cubic root of 81660248 is about 433.8472991642.

The spelling of 81660248 in words is "eighty-one million, six hundred sixty thousand, two hundred forty-eight".