22728782 has 4 divisors (see below), whose sum is σ = 34093176. Its totient is φ = 11364390.

The previous prime is 22728781. The next prime is 22728793. The reversal of 22728782 is 28782722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28782722 = 2 ⋅14391361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22728781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5682194 + ... + 5682197.

It is an arithmetic number, because the mean of its divisors is an integer number (8523294).

Almost surely, 2^22728782 is an apocalyptic number.

22728782 is a deficient number, since it is larger than the sum of its proper divisors (11364394).

22728782 is a wasteful number, since it uses less digits than its factorization.

22728782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11364393.

The product of its digits is 50176, while the sum is 38.

The square root of 22728782 is about 4767.4712374591. The cubic root of 22728782 is about 283.2644375354.

The spelling of 22728782 in words is "twenty-two million, seven hundred twenty-eight thousand, seven hundred eighty-two".