81769872 has 40 divisors (see below), whose sum is σ = 211575744. Its totient is φ = 27213184.

The previous prime is 81769871. The next prime is 81769913. The reversal of 81769872 is 27896718.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (81769871) 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, 46318 + ... + 48050.

Almost surely, 2^81769872 is an apocalyptic number.

It is an amenable number.

81769872 is an abundant number, since it is smaller than the sum of its proper divisors (129805872).

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

81769872 is a wasteful number, since it uses less digits than its factorization.

81769872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727 (or 2721 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 81769872 is about 9042.6695173494. The cubic root of 81769872 is about 434.0413503750.

The spelling of 81769872 in words is "eighty-one million, seven hundred sixty-nine thousand, eight hundred seventy-two".