81606022 has 8 divisors (see below), whose sum is σ = 123085872. Its totient is φ = 40577400.

The previous prime is 81606013. The next prime is 81606023. The reversal of 81606022 is 22060618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81606023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112354 + ... + 113077.

It is an arithmetic number, because the mean of its divisors is an integer number (15385734).

Almost surely, 2^81606022 is an apocalyptic number.

81606022 is a deficient number, since it is larger than the sum of its proper divisors (41479850).

81606022 is a wasteful number, since it uses less digits than its factorization.

81606022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225614.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81606022 is about 9033.6051496620. The cubic root of 81606022 is about 433.7512466640.

The spelling of 81606022 in words is "eighty-one million, six hundred six thousand, twenty-two".