81474732 has 36 divisors (see below), whose sum is σ = 206246040. Its totient is φ = 27119232.

The previous prime is 81474719. The next prime is 81474733. The reversal of 81474732 is 23747418.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81474733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35203 + ... + 37445.

Almost surely, 2^81474732 is an apocalyptic number.

It is an amenable number.

81474732 is an abundant number, since it is smaller than the sum of its proper divisors (124771308).

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

81474732 is a wasteful number, since it uses less digits than its factorization.

81474732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262 (or 3257 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 81474732 is about 9026.3354690594. The cubic root of 81474732 is about 433.5185115198.

The spelling of 81474732 in words is "eighty-one million, four hundred seventy-four thousand, seven hundred thirty-two".