81948894 has 16 divisors (see below), whose sum is σ = 164131968. Its totient is φ = 27277272.

The previous prime is 81948887. The next prime is 81948899. The reversal of 81948894 is 49884918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81948899) 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, 5032 + ... + 13755.

It is an arithmetic number, because the mean of its divisors is an integer number (10258248).

Almost surely, 2^81948894 is an apocalyptic number.

81948894 is an abundant number, since it is smaller than the sum of its proper divisors (82183074).

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

81948894 is a wasteful number, since it uses less digits than its factorization.

81948894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19519.

The product of its digits is 663552, while the sum is 51.

The square root of 81948894 is about 9052.5628415383. The cubic root of 81948894 is about 434.3578741001.

The spelling of 81948894 in words is "eighty-one million, nine hundred forty-eight thousand, eight hundred ninety-four".