81682488 has 24 divisors (see below), whose sum is σ = 221223600. Its totient is φ = 27227472.

The previous prime is 81682481. The next prime is 81682493. The reversal of 81682488 is 88428618.

It is a happy number.

81682488 is a `hidden beast` number, since 8 + 168 + 2 + 488 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81682481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567168 + ... + 567311.

It is an arithmetic number, because the mean of its divisors is an integer number (9217650).

Almost surely, 2^81682488 is an apocalyptic number.

It is an amenable number.

81682488 is an abundant number, since it is smaller than the sum of its proper divisors (139541112).

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

81682488 is a wasteful number, since it uses less digits than its factorization.

81682488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134491 (or 1134484 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 81682488 is about 9037.8364667657. The cubic root of 81682488 is about 433.8866813947.

The spelling of 81682488 in words is "eighty-one million, six hundred eighty-two thousand, four hundred eighty-eight".