22278487 has 12 divisors (see below), whose sum is σ = 28272456. Its totient is φ = 17359440.

The previous prime is 22278439. The next prime is 22278493. The reversal of 22278487 is 78487222.

It is not a de Polignac number, because 22278487 - 2¹⁵ = 22245719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22278407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20128 + ... + 21205.

It is an arithmetic number, because the mean of its divisors is an integer number (2356038).

Almost surely, 2^22278487 is an apocalyptic number.

22278487 is a deficient number, since it is larger than the sum of its proper divisors (5993969).

22278487 is a wasteful number, since it uses less digits than its factorization.

22278487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41358 (or 41351 counting only the distinct ones).

The product of its digits is 100352, while the sum is 40.

The square root of 22278487 is about 4720.0092160927. The cubic root of 22278487 is about 281.3812995502.

The spelling of 22278487 in words is "twenty-two million, two hundred seventy-eight thousand, four hundred eighty-seven".