81087552 has 378 divisors, whose sum is σ = 309988458. Its totient is φ = 20127744.

The previous prime is 81087533. The next prime is 81087553. The reversal of 81087552 is 25578018.

It can be written as a sum of positive squares in 3 ways, for example, as 1806336 + 79281216 = 1344^2 + 8904^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81087553) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 4769848 + ... + 4769864.

Almost surely, 2^81087552 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 81087552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154994229).

81087552 is an abundant number, since it is smaller than the sum of its proper divisors (228900906).

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

81087552 is a wasteful number, since it uses less digits than its factorization.

81087552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 81087552 is about 9004.8626863490. The cubic root of 81087552 is about 432.8307061125.

The spelling of 81087552 in words is "eighty-one million, eighty-seven thousand, five hundred fifty-two".