81622618 has 16 divisors (see below), whose sum is σ = 152645184. Its totient is φ = 31800960.

The previous prime is 81622609. The next prime is 81622631.

81622618 is nontrivially palindromic in base 10.

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, 264855 + ... + 265162.

It is an arithmetic number, because the mean of its divisors is an integer number (9540324).

Almost surely, 2^81622618 is an apocalyptic number.

81622618 is a deficient number, since it is larger than the sum of its proper divisors (71022566).

81622618 is a wasteful number, since it uses less digits than its factorization.

81622618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530037.

The product of its digits is 9216, while the sum is 34.

The square root of 81622618 is about 9034.5236731108. The cubic root of 81622618 is about 433.7806482841.

The spelling of 81622618 in words is "eighty-one million, six hundred twenty-two thousand, six hundred eighteen".