81258132 has 24 divisors (see below), whose sum is σ = 194012896. Its totient is φ = 26455968.

The previous prime is 81258127. The next prime is 81258137. The reversal of 81258132 is 23185218.

It is an interprime number because it is at equal distance from previous prime (81258127) and next prime (81258137).

It is a super-2 number, since 2×81258132² = 13205768032258848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81258132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81258137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78223 + ... + 79254.

Almost surely, 2^81258132 is an apocalyptic number.

It is an amenable number.

81258132 is an abundant number, since it is smaller than the sum of its proper divisors (112754764).

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

81258132 is a wasteful number, since it uses less digits than its factorization.

81258132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157527 (or 157525 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 81258132 is about 9014.3292595733. The cubic root of 81258132 is about 433.1340019451.

The spelling of 81258132 in words is "eighty-one million, two hundred fifty-eight thousand, one hundred thirty-two".