81622349 has 16 divisors (see below), whose sum is σ = 87091200. Its totient is φ = 76368000.

The previous prime is 81622339. The next prime is 81622357. The reversal of 81622349 is 94322618.

It is a cyclic number.

It is not a de Polignac number, because 81622349 - 2¹² = 81618253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81622319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189164 + ... + 189594.

It is an arithmetic number, because the mean of its divisors is an integer number (5443200).

Almost surely, 2^81622349 is an apocalyptic number.

It is an amenable number.

81622349 is a deficient number, since it is larger than the sum of its proper divisors (5468851).

81622349 is a wasteful number, since it uses less digits than its factorization.

81622349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its digits is 20736, while the sum is 35.

The square root of 81622349 is about 9034.5087857614. The cubic root of 81622349 is about 433.7801717531.

The spelling of 81622349 in words is "eighty-one million, six hundred twenty-two thousand, three hundred forty-nine".