22545729 has 16 divisors (see below), whose sum is σ = 33969600. Its totient is φ = 14774688.

The previous prime is 22545709. The next prime is 22545739. The reversal of 22545729 is 92754522.

It is a happy number.

It is not a de Polignac number, because 22545729 - 2⁹ = 22545217 is a prime.

It is a super-2 number, since 2×22545729² = 1016619792282882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22545693 and 22545702.

It is not an unprimeable number, because it can be changed into a prime (22545709) 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, 5484 + ... + 8669.

It is an arithmetic number, because the mean of its divisors is an integer number (2123100).

Almost surely, 2^22545729 is an apocalyptic number.

It is an amenable number.

22545729 is a deficient number, since it is larger than the sum of its proper divisors (11423871).

22545729 is a wasteful number, since it uses less digits than its factorization.

22545729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14221 (or 14215 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 22545729 is about 4748.2343034016. The cubic root of 22545729 is about 282.5019354032.

It can be divided in two parts, 225 and 45729, that added together give a palindrome (45954).

The spelling of 22545729 in words is "twenty-two million, five hundred forty-five thousand, seven hundred twenty-nine".