81542296 has 16 divisors (see below), whose sum is σ = 166791240. Its totient is φ = 37064640.

The previous prime is 81542273. The next prime is 81542297. The reversal of 81542296 is 69224518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81542297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463221 + ... + 463396.

Almost surely, 2^81542296 is an apocalyptic number.

It is an amenable number.

81542296 is an abundant number, since it is smaller than the sum of its proper divisors (85248944).

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

81542296 is a wasteful number, since it uses less digits than its factorization.

81542296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926634 (or 926630 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 81542296 is about 9030.0772975651. The cubic root of 81542296 is about 433.6383120652.

It can be divided in two parts, 815422 and 96, that added together give a palindrome (815518).

The spelling of 81542296 in words is "eighty-one million, five hundred forty-two thousand, two hundred ninety-six".