28042399 has 8 divisors (see below), whose sum is σ = 34962048. Its totient is φ = 21851160.

The previous prime is 28042397. The next prime is 28042447. The reversal of 28042399 is 99324082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28042399 - 2¹ = 28042397 is a prime.

It is a super-2 number, since 2×28042399² = 1572752283350402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28042397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182017 + ... + 182170.

It is an arithmetic number, because the mean of its divisors is an integer number (4370256).

Almost surely, 2^28042399 is an apocalyptic number.

28042399 is a deficient number, since it is larger than the sum of its proper divisors (6919649).

28042399 is a wasteful number, since it uses less digits than its factorization.

28042399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364205.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28042399 is about 5295.5074355533. The cubic root of 28042399 is about 303.8120917170.

It can be divided in two parts, 28042 and 399, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 28042399 in words is "twenty-eight million, forty-two thousand, three hundred ninety-nine".