22478257 has 4 divisors (see below), whose sum is σ = 22700916. Its totient is φ = 22255600.

The previous prime is 22478251. The next prime is 22478303. The reversal of 22478257 is 75287422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9511056 + 12967201 = 3084^2 + 3601^2 .

It is a cyclic number.

It is not a de Polignac number, because 22478257 - 2³ = 22478249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22478251) 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, 111178 + ... + 111379.

It is an arithmetic number, because the mean of its divisors is an integer number (5675229).

Almost surely, 2^22478257 is an apocalyptic number.

It is an amenable number.

22478257 is a deficient number, since it is larger than the sum of its proper divisors (222659).

22478257 is a wasteful number, since it uses less digits than its factorization.

22478257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222658.

The product of its digits is 62720, while the sum is 37.

The square root of 22478257 is about 4741.1240228452. The cubic root of 22478257 is about 282.2198418165.

The spelling of 22478257 in words is "twenty-two million, four hundred seventy-eight thousand, two hundred fifty-seven".