22780172 has 12 divisors (see below), whose sum is σ = 39915120. Its totient is φ = 11375856.

The previous prime is 22780171. The next prime is 22780207. The reversal of 22780172 is 27108722.

It is not an unprimeable number, because it can be changed into a prime (22780171) 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, 578 + ... + 6774.

It is an arithmetic number, because the mean of its divisors is an integer number (3326260).

Almost surely, 2^22780172 is an apocalyptic number.

It is an amenable number.

22780172 is a deficient number, since it is larger than the sum of its proper divisors (17134948).

22780172 is a wasteful number, since it uses less digits than its factorization.

22780172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7120 (or 7118 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 22780172 is about 4772.8578441014. The cubic root of 22780172 is about 283.4777647323.

Adding to 22780172 its reverse (27108722), we get a palindrome (49888894).

The spelling of 22780172 in words is "twenty-two million, seven hundred eighty thousand, one hundred seventy-two".