28155922 has 4 divisors (see below), whose sum is σ = 42233886. Its totient is φ = 14077960.

The previous prime is 28155917. The next prime is 28155931. The reversal of 28155922 is 22955182.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 22099401 + 6056521 = 4701^2 + 2461^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7038979 + ... + 7038982.

Almost surely, 2^28155922 is an apocalyptic number.

28155922 is a deficient number, since it is larger than the sum of its proper divisors (14077964).

28155922 is a wasteful number, since it uses less digits than its factorization.

28155922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14077963.

The product of its digits is 14400, while the sum is 34.

The square root of 28155922 is about 5306.2154121370. The cubic root of 28155922 is about 304.2215101291.

The spelling of 28155922 in words is "twenty-eight million, one hundred fifty-five thousand, nine hundred twenty-two".