28277890 has 32 divisors (see below), whose sum is σ = 55319040. Its totient is φ = 10368000.

The previous prime is 28277869. The next prime is 28277897. The reversal of 28277890 is 9877282.

It is not an unprimeable number, because it can be changed into a prime (28277897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3490 + ... + 8290.

It is an arithmetic number, because the mean of its divisors is an integer number (1728720).

Almost surely, 2^28277890 is an apocalyptic number.

28277890 is a deficient number, since it is larger than the sum of its proper divisors (27041150).

28277890 is a wasteful number, since it uses less digits than its factorization.

28277890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4858.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 28277890 is about 5317.6959296297. The cubic root of 28277890 is about 304.6601607641.

The spelling of 28277890 in words is "twenty-eight million, two hundred seventy-seven thousand, eight hundred ninety".