28399372 has 6 divisors (see below), whose sum is σ = 49698908. Its totient is φ = 14199684.

The previous prime is 28399331. The next prime is 28399373. The reversal of 28399372 is 27399382.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28399373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3549918 + ... + 3549925.

Almost surely, 2^28399372 is an apocalyptic number.

It is an amenable number.

28399372 is a deficient number, since it is larger than the sum of its proper divisors (21299536).

28399372 is a wasteful number, since it uses less digits than its factorization.

28399372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7099847 (or 7099845 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 28399372 is about 5329.1061164139. The cubic root of 28399372 is about 305.0958115186.

The spelling of 28399372 in words is "twenty-eight million, three hundred ninety-nine thousand, three hundred seventy-two".