81788622 has 16 divisors (see below), whose sum is σ = 163706880. Its totient is φ = 27241272.

The previous prime is 81788599. The next prime is 81788627. The reversal of 81788622 is 22688718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81788627) 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, 4083 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (10231680).

Almost surely, 2^81788622 is an apocalyptic number.

81788622 is an abundant number, since it is smaller than the sum of its proper divisors (81918258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81788622 is a wasteful number, since it uses less digits than its factorization.

81788622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10807.

The product of its digits is 86016, while the sum is 42.

The square root of 81788622 is about 9043.7062092927. The cubic root of 81788622 is about 434.0745233647.

The spelling of 81788622 in words is "eighty-one million, seven hundred eighty-eight thousand, six hundred twenty-two".