81923622 has 16 divisors (see below), whose sum is σ = 178742592. Its totient is φ = 24825320.

The previous prime is 81923609. The next prime is 81923623. The reversal of 81923622 is 22632918.

It is a happy number.

It is a super-2 number, since 2×81923622² = 13422959683197768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81923623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620568 + ... + 620699.

It is an arithmetic number, because the mean of its divisors is an integer number (11171412).

Almost surely, 2^81923622 is an apocalyptic number.

81923622 is an abundant number, since it is smaller than the sum of its proper divisors (96818970).

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

81923622 is a wasteful number, since it uses less digits than its factorization.

81923622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241283.

The product of its digits is 10368, while the sum is 33.

The square root of 81923622 is about 9051.1668860982. The cubic root of 81923622 is about 434.3132193555.

The spelling of 81923622 in words is "eighty-one million, nine hundred twenty-three thousand, six hundred twenty-two".