22478 has 4 divisors (see below), whose sum is σ = 33720. Its totient is φ = 11238.

The previous prime is 22469. The next prime is 22481. The reversal of 22478 is 87422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87422 = 2 ⋅43711.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5618 + ... + 5621.

It is an arithmetic number, because the mean of its divisors is an integer number (8430).

2²²⁴⁷⁸ is an apocalyptic number.

22478 is a deficient number, since it is larger than the sum of its proper divisors (11242).

22478 is a wasteful number, since it uses less digits than its factorization.

22478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11241.

The product of its digits is 896, while the sum is 23.

The square root of 22478 is about 149.9266487320. The cubic root of 22478 is about 28.2218766247.

The spelling of 22478 in words is "twenty-two thousand, four hundred seventy-eight".