81648892 has 24 divisors (see below), whose sum is σ = 162930096. Its totient is φ = 35467008.

The previous prime is 81648869. The next prime is 81648893. The reversal of 81648892 is 29884618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81648893) 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, 45298 + ... + 47065.

It is an arithmetic number, because the mean of its divisors is an integer number (6788754).

Almost surely, 2^81648892 is an apocalyptic number.

It is an amenable number.

81648892 is a deficient number, since it is larger than the sum of its proper divisors (81281204).

81648892 is a wasteful number, since it uses less digits than its factorization.

81648892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92397 (or 92395 counting only the distinct ones).

The product of its digits is 221184, while the sum is 46.

The square root of 81648892 is about 9035.9776449480. The cubic root of 81648892 is about 433.8271873862.

The spelling of 81648892 in words is "eighty-one million, six hundred forty-eight thousand, eight hundred ninety-two".