81802458 has 24 divisors (see below), whose sum is σ = 177746400. Its totient is φ = 27189384.

The previous prime is 81802439. The next prime is 81802493. The reversal of 81802458 is 85420818.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133 + ... + 12791.

It is an arithmetic number, because the mean of its divisors is an integer number (7406100).

Almost surely, 2^81802458 is an apocalyptic number.

81802458 is an abundant number, since it is smaller than the sum of its proper divisors (95943942).

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

81802458 is a wasteful number, since it uses less digits than its factorization.

81802458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13026 (or 13023 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 81802458 is about 9044.4711288168. The cubic root of 81802458 is about 434.0989991264.

The spelling of 81802458 in words is "eighty-one million, eight hundred two thousand, four hundred fifty-eight".