28428399 has 12 divisors (see below), whose sum is σ = 41441400. Its totient is φ = 18777744.

The previous prime is 28428397. The next prime is 28428451. The reversal of 28428399 is 99382482.

28428399 is a `hidden beast` number, since 284 + 283 + 99 = 666.

It is not a de Polignac number, because 28428399 - 2¹ = 28428397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28428397) 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, 13509 + ... + 15470.

It is an arithmetic number, because the mean of its divisors is an integer number (3453450).

Almost surely, 2^28428399 is an apocalyptic number.

28428399 is a deficient number, since it is larger than the sum of its proper divisors (13013001).

28428399 is a wasteful number, since it uses less digits than its factorization.

28428399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29094 (or 29091 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 28428399 is about 5331.8288607194. The cubic root of 28428399 is about 305.1997222740.

The spelling of 28428399 in words is "twenty-eight million, four hundred twenty-eight thousand, three hundred ninety-nine".