28623418 has 4 divisors (see below), whose sum is σ = 42935130. Its totient is φ = 14311708.

The previous prime is 28623403. The next prime is 28623421. The reversal of 28623418 is 81432682.

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., 22781529 + 5841889 = 4773^2 + 2417^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7155853 + ... + 7155856.

Almost surely, 2^28623418 is an apocalyptic number.

28623418 is a deficient number, since it is larger than the sum of its proper divisors (14311712).

28623418 is a wasteful number, since it uses less digits than its factorization.

28623418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14311711.

The product of its digits is 18432, while the sum is 34.

The square root of 28623418 is about 5350.0857937046. The cubic root of 28623418 is about 305.8960231694.

The spelling of 28623418 in words is "twenty-eight million, six hundred twenty-three thousand, four hundred eighteen".