28047890 has 16 divisors (see below), whose sum is σ = 54370008. Its totient is φ = 10356096.

The previous prime is 28047889. The next prime is 28047907. The reversal of 28047890 is 9874082.

It can be written as a sum of positive squares in 4 ways, for example, as 21631801 + 6416089 = 4651^2 + 2533^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107747 + ... + 108006.

Almost surely, 2^28047890 is an apocalyptic number.

28047890 is a deficient number, since it is larger than the sum of its proper divisors (26322118).

28047890 is a wasteful number, since it uses less digits than its factorization.

28047890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215773.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28047890 is about 5296.0258685169. The cubic root of 28047890 is about 303.8319203025.

The spelling of 28047890 in words is "twenty-eight million, forty-seven thousand, eight hundred ninety".