22478157 has 12 divisors (see below), whose sum is σ = 34966204. Its totient is φ = 13832640.

The previous prime is 22478149. The next prime is 22478167. The reversal of 22478157 is 75187422.

It can be written as a sum of positive squares in 2 ways, for example, as 13351716 + 9126441 = 3654^2 + 3021^2 .

It is not a de Polignac number, because 22478157 - 2³ = 22478149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22478167) 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, 95944 + ... + 96177.

Almost surely, 2^22478157 is an apocalyptic number.

It is an amenable number.

22478157 is a deficient number, since it is larger than the sum of its proper divisors (12488047).

22478157 is a wasteful number, since it uses less digits than its factorization.

22478157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192140 (or 192137 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 22478157 is about 4741.1134768111. The cubic root of 22478157 is about 282.2194233079.

It can be divided in two parts, 2247 and 8157, that added together give a square (10404 = 102²).

The spelling of 22478157 in words is "twenty-two million, four hundred seventy-eight thousand, one hundred fifty-seven".