81948732 has 24 divisors (see below), whose sum is σ = 193003776. Its totient is φ = 27060528.

The previous prime is 81948731. The next prime is 81948733. The reversal of 81948732 is 23784918.

It is an interprime number because it is at equal distance from previous prime (81948731) and next prime (81948733).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81948731) 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, 30628 + ... + 33195.

It is an arithmetic number, because the mean of its divisors is an integer number (8041824).

Almost surely, 2^81948732 is an apocalyptic number.

It is an amenable number.

81948732 is an abundant number, since it is smaller than the sum of its proper divisors (111055044).

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

81948732 is a wasteful number, since it uses less digits than its factorization.

81948732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63937 (or 63935 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 81948732 is about 9052.5538937915. The cubic root of 81948732 is about 434.3575878810.

The spelling of 81948732 in words is "eighty-one million, nine hundred forty-eight thousand, seven hundred thirty-two".