28399554 has 24 divisors (see below), whose sum is σ = 65152620. Its totient is φ = 8909568.

The previous prime is 28399541. The next prime is 28399559. The reversal of 28399554 is 45599382.

28399554 is a `hidden beast` number, since 2 + 8 + 3 + 99 + 554 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24770529 + 3629025 = 4977^2 + 1905^2 .

It is not an unprimeable number, because it can be changed into a prime (28399559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46099 + ... + 46710.

Almost surely, 2^28399554 is an apocalyptic number.

28399554 is an abundant number, since it is smaller than the sum of its proper divisors (36753066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28399554 is a wasteful number, since it uses less digits than its factorization.

28399554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92834 (or 92831 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 28399554 is about 5329.1231924211. The cubic root of 28399554 is about 305.0964632621.

The spelling of 28399554 in words is "twenty-eight million, three hundred ninety-nine thousand, five hundred fifty-four".