22249578 has 16 divisors (see below), whose sum is σ = 47922336. Its totient is φ = 6846000.

The previous prime is 22249573. The next prime is 22249613. The reversal of 22249578 is 87594222.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (22249571) 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, 142548 + ... + 142703.

It is an arithmetic number, because the mean of its divisors is an integer number (2995146).

Almost surely, 2^22249578 is an apocalyptic number.

22249578 is an abundant number, since it is smaller than the sum of its proper divisors (25672758).

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

22249578 is a wasteful number, since it uses less digits than its factorization.

22249578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285269.

The product of its digits is 80640, while the sum is 39.

The square root of 22249578 is about 4716.9458339057. The cubic root of 22249578 is about 281.2595382444.

The spelling of 22249578 in words is "twenty-two million, two hundred forty-nine thousand, five hundred seventy-eight".