81247632 has 40 divisors (see below), whose sum is σ = 211980480. Its totient is φ = 26812800.

The previous prime is 81247627. The next prime is 81247637. The reversal of 81247632 is 23674218.

It is an interprime number because it is at equal distance from previous prime (81247627) and next prime (81247637).

It is a junction number, because it is equal to n+sod(n) for n = 81247593 and 81247602.

It is not an unprimeable number, because it can be changed into a prime (81247637) 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, 3532 + ... + 13227.

It is an arithmetic number, because the mean of its divisors is an integer number (5299512).

Almost surely, 2^81247632 is an apocalyptic number.

It is an amenable number.

81247632 is an abundant number, since it is smaller than the sum of its proper divisors (130732848).

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

81247632 is a wasteful number, since it uses less digits than its factorization.

81247632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16871 (or 16865 counting only the distinct ones).

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

The square root of 81247632 is about 9013.7468346964. The cubic root of 81247632 is about 433.1153449286.

The spelling of 81247632 in words is "eighty-one million, two hundred forty-seven thousand, six hundred thirty-two".