28770890 has 16 divisors (see below), whose sum is σ = 51851880. Its totient is φ = 11494080.

The previous prime is 28770869. The next prime is 28770899. The reversal of 28770890 is 9807782.

28770890 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in 4 ways, for example, as 28697449 + 73441 = 5357^2 + 271^2 .

It is a super-2 number, since 2×28770890² = 1655528222784200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28770899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11120 + ... + 13460.

Almost surely, 2^28770890 is an apocalyptic number.

28770890 is a deficient number, since it is larger than the sum of its proper divisors (23080990).

28770890 is a wasteful number, since it uses less digits than its factorization.

28770890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3577.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 28770890 is about 5363.8502961958. The cubic root of 28770890 is about 306.4204637556.

The spelling of 28770890 in words is "twenty-eight million, seven hundred seventy thousand, eight hundred ninety".