81487152 has 60 divisors (see below), whose sum is σ = 229439184. Its totient is φ = 26997120.

The previous prime is 81487141. The next prime is 81487163. The reversal of 81487152 is 25178418.

It is an interprime number because it is at equal distance from previous prime (81487141) and next prime (81487163).

It is a super-2 number, since 2×81487152² = 13280311882142208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23277 + ... + 26547.

Almost surely, 2^81487152 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 81487152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114719592).

81487152 is an abundant number, since it is smaller than the sum of its proper divisors (147952032).

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

81487152 is a wasteful number, since it uses less digits than its factorization.

81487152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458 (or 3449 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 81487152 is about 9027.0234296805. The cubic root of 81487152 is about 433.5405389067.

The spelling of 81487152 in words is "eighty-one million, four hundred eighty-seven thousand, one hundred fifty-two".