81628522 has 16 divisors (see below), whose sum is σ = 129317760. Its totient is φ = 38536992.

The previous prime is 81628517. The next prime is 81628523. The reversal of 81628522 is 22582618.

It is not an unprimeable number, because it can be changed into a prime (81628523) 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, 8463 + ... + 15325.

It is an arithmetic number, because the mean of its divisors is an integer number (8082360).

Almost surely, 2^81628522 is an apocalyptic number.

81628522 is a deficient number, since it is larger than the sum of its proper divisors (47689238).

81628522 is a wasteful number, since it uses less digits than its factorization.

81628522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7197.

The product of its digits is 15360, while the sum is 34.

The square root of 81628522 is about 9034.8504138143. The cubic root of 81628522 is about 433.7911069015.

The spelling of 81628522 in words is "eighty-one million, six hundred twenty-eight thousand, five hundred twenty-two".