22978817 has 16 divisors (see below), whose sum is σ = 25367040. Its totient is φ = 20741952.

The previous prime is 22978811. The next prime is 22978829. The reversal of 22978817 is 71887922.

It is a de Polignac number, because none of the positive numbers 2^k-22978817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22978811) 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, 30983 + ... + 31715.

It is an arithmetic number, because the mean of its divisors is an integer number (1585440).

Almost surely, 2^22978817 is an apocalyptic number.

It is an amenable number.

22978817 is a deficient number, since it is larger than the sum of its proper divisors (2388223).

22978817 is a wasteful number, since it uses less digits than its factorization.

22978817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832.

The product of its digits is 112896, while the sum is 44.

The square root of 22978817 is about 4793.6225341593. The cubic root of 22978817 is about 284.2993644520.

The spelling of 22978817 in words is "twenty-two million, nine hundred seventy-eight thousand, eight hundred seventeen".