81622088 has 8 divisors (see below), whose sum is σ = 153041430. Its totient is φ = 40811040.

The previous prime is 81622063. The next prime is 81622109. The reversal of 81622088 is 88022618.

It can be written as a sum of positive squares in only one way, i.e., 76702564 + 4919524 = 8758^2 + 2218^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 5101373 + ... + 5101388.

Almost surely, 2^81622088 is an apocalyptic number.

It is an amenable number.

81622088 is a deficient number, since it is larger than the sum of its proper divisors (71419342).

81622088 is a wasteful number, since it uses less digits than its factorization.

81622088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202767 (or 10202763 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 81622088 is about 9034.4943411350. The cubic root of 81622088 is about 433.7797093930.

The spelling of 81622088 in words is "eighty-one million, six hundred twenty-two thousand, eighty-eight".