81054216 has 32 divisors (see below), whose sum is σ = 225151200. Its totient is φ = 27018000.

The previous prime is 81054199. The next prime is 81054241. The reversal of 81054216 is 61245018.

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 81054216.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187410 + ... + 187841.

It is an arithmetic number, because the mean of its divisors is an integer number (7035975).

Almost surely, 2^81054216 is an apocalyptic number.

It is an amenable number.

81054216 is an abundant number, since it is smaller than the sum of its proper divisors (144096984).

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

81054216 is a wasteful number, since it uses less digits than its factorization.

81054216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375266 (or 375256 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81054216 is about 9003.0114961606. The cubic root of 81054216 is about 432.7713841335.

It can be divided in two parts, 8105 and 4216, that added together give a palindrome (12321).

The spelling of 81054216 in words is "eighty-one million, fifty-four thousand, two hundred sixteen".