28004290 has 16 divisors (see below), whose sum is σ = 53061120. Its totient is φ = 10612080.

The previous prime is 28004281. The next prime is 28004293. The reversal of 28004290 is 9240082.

It is not an unprimeable number, because it can be changed into a prime (28004293) 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, 73506 + ... + 73885.

It is an arithmetic number, because the mean of its divisors is an integer number (3316320).

Almost surely, 2^28004290 is an apocalyptic number.

28004290 is a deficient number, since it is larger than the sum of its proper divisors (25056830).

28004290 is a wasteful number, since it uses less digits than its factorization.

28004290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147417.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28004290 is about 5291.9079735007. The cubic root of 28004290 is about 303.6744046893.

The spelling of 28004290 in words is "twenty-eight million, four thousand, two hundred ninety".