81601488 has 30 divisors (see below), whose sum is σ = 228371234. Its totient is φ = 27200448.

The previous prime is 81601453. The next prime is 81601501. The reversal of 81601488 is 88410618.

81601488 is a `hidden beast` number, since 8 + 1 + 601 + 48 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 75898944 + 5702544 = 8712^2 + 2388^2 .

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 5 ways as a sum of consecutive naturals, for example, 283195 + ... + 283482.

Almost surely, 2^81601488 is an apocalyptic number.

It is an amenable number.

81601488 is an abundant number, since it is smaller than the sum of its proper divisors (146769746).

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

81601488 is a wasteful number, since it uses less digits than its factorization.

81601488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566691 (or 566682 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 81601488 is about 9033.3541943179. The cubic root of 81601488 is about 433.7432134963.

The spelling of 81601488 in words is "eighty-one million, six hundred one thousand, four hundred eighty-eight".