81600648 has 32 divisors (see below), whose sum is σ = 208344960. Its totient is φ = 26621120.

The previous prime is 81600647. The next prime is 81600667. The reversal of 81600648 is 84600618.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81600643) 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, 35043 + ... + 37298.

It is an arithmetic number, because the mean of its divisors is an integer number (6510780).

Almost surely, 2^81600648 is an apocalyptic number.

It is an amenable number.

81600648 is an abundant number, since it is smaller than the sum of its proper divisors (126744312).

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

81600648 is a wasteful number, since it uses less digits than its factorization.

81600648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72397 (or 72393 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81600648 is about 9033.3076998406. The cubic root of 81600648 is about 433.7417251838.

The spelling of 81600648 in words is "eighty-one million, six hundred thousand, six hundred forty-eight".