28907290 has 16 divisors (see below), whose sum is σ = 52887240. Its totient is φ = 11373120.

The previous prime is 28907279. The next prime is 28907353. The reversal of 28907290 is 9270982.

It can be written as a sum of positive squares in 4 ways, for example, as 6335289 + 22572001 = 2517^2 + 4751^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23085 + ... + 24304.

Almost surely, 2^28907290 is an apocalyptic number.

28907290 is a deficient number, since it is larger than the sum of its proper divisors (23979950).

28907290 is a wasteful number, since it uses less digits than its factorization.

28907290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47457.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 28907290 is about 5376.5500090672. The cubic root of 28907290 is about 306.9039370951.

It can be divided in two parts, 2890 and 7290, that multiplied together give a square (21068100 = 4590²).

The spelling of 28907290 in words is "twenty-eight million, nine hundred seven thousand, two hundred ninety".