28404027 has 28 divisors (see below), whose sum is σ = 43545120. Its totient is φ = 18510768.

The previous prime is 28404023. The next prime is 28404041. The reversal of 28404027 is 72040482.

It is not a de Polignac number, because 28404027 - 2² = 28404023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28404023) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 33849 + ... + 34677.

Almost surely, 2^28404027 is an apocalyptic number.

28404027 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28404027 is a deficient number, since it is larger than the sum of its proper divisors (15141093).

28404027 is an frugal number, since it uses more digits than its factorization.

28404027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28404027 is about 5329.5428509395. The cubic root of 28404027 is about 305.1124802371.

The spelling of 28404027 in words is "twenty-eight million, four hundred four thousand, twenty-seven".