81272152 has 32 divisors (see below), whose sum is σ = 169772400. Its totient is φ = 36215424.

The previous prime is 81272131. The next prime is 81272159. The reversal of 81272152 is 25127218.

81272152 is nontrivially palindromic in base 14.

It is a super-2 number, since 2×81272152² = 13210325381422208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81272152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272159) 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, 10458 + ... + 16489.

Almost surely, 2^81272152 is an apocalyptic number.

It is an amenable number.

81272152 is an abundant number, since it is smaller than the sum of its proper divisors (88500248).

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

81272152 is a wasteful number, since it uses less digits than its factorization.

81272152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26995 (or 26991 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 81272152 is about 9015.1068767930. The cubic root of 81272152 is about 433.1589109987.

The spelling of 81272152 in words is "eighty-one million, two hundred seventy-two thousand, one hundred fifty-two".