81032616 has 64 divisors (see below), whose sum is σ = 257251200. Its totient is φ = 23151744.

The previous prime is 81032599. The next prime is 81032621. The reversal of 81032616 is 61623018.

81032616 is a `hidden beast` number, since 8 + 10 + 32 + 616 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 81032616.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25285 + ... + 28308.

It is an arithmetic number, because the mean of its divisors is an integer number (4019550).

Almost surely, 2^81032616 is an apocalyptic number.

It is an amenable number.

81032616 is an abundant number, since it is smaller than the sum of its proper divisors (176218584).

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

81032616 is a wasteful number, since it uses less digits than its factorization.

81032616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53615 (or 53605 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81032616 is about 9001.8118176287. The cubic root of 81032616 is about 432.7329378818.

The spelling of 81032616 in words is "eighty-one million, thirty-two thousand, six hundred sixteen".