81463272 has 32 divisors (see below), whose sum is σ = 222173280. Its totient is φ = 24685760.

The previous prime is 81463271. The next prime is 81463297. The reversal of 81463272 is 27236418.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81463271) 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, 154023 + ... + 154550.

It is an arithmetic number, because the mean of its divisors is an integer number (6942915).

Almost surely, 2^81463272 is an apocalyptic number.

It is an amenable number.

81463272 is an abundant number, since it is smaller than the sum of its proper divisors (140710008).

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

81463272 is a wasteful number, since it uses less digits than its factorization.

81463272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308593 (or 308589 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 81463272 is about 9025.7006376237. The cubic root of 81463272 is about 433.4981847470.

The spelling of 81463272 in words is "eighty-one million, four hundred sixty-three thousand, two hundred seventy-two".