81235722 has 8 divisors (see below), whose sum is σ = 162471456. Its totient is φ = 27078572.

The previous prime is 81235709. The next prime is 81235723. The reversal of 81235722 is 22753218.

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

81235722 is an admirable number.

It is a super-2 number, since 2×81235722² = 13198485057722568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81235722.

It is not an unprimeable number, because it can be changed into a prime (81235723) 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, 6769638 + ... + 6769649.

It is an arithmetic number, because the mean of its divisors is an integer number (20308932).

Almost surely, 2^81235722 is an apocalyptic number.

81235722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81235722 is a wasteful number, since it uses less digits than its factorization.

81235722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13539292.

The product of its digits is 6720, while the sum is 30.

The square root of 81235722 is about 9013.0861529223. The cubic root of 81235722 is about 433.0941805956.

The spelling of 81235722 in words is "eighty-one million, two hundred thirty-five thousand, seven hundred twenty-two".