81459216 has 40 divisors (see below), whose sum is σ = 233819360. Its totient is φ = 27152928.

The previous prime is 81459199. The next prime is 81459221. The reversal of 81459216 is 61295418.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 93850 + ... + 94713.

It is an arithmetic number, because the mean of its divisors is an integer number (5845484).

Almost surely, 2^81459216 is an apocalyptic number.

It is an amenable number.

81459216 is an abundant number, since it is smaller than the sum of its proper divisors (152360144).

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

81459216 is a wasteful number, since it uses less digits than its factorization.

81459216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188580 (or 188568 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 81459216 is about 9025.4759431290. The cubic root of 81459216 is about 433.4909901026.

The spelling of 81459216 in words is "eighty-one million, four hundred fifty-nine thousand, two hundred sixteen".