28777930 has 16 divisors (see below), whose sum is σ = 52314984. Its totient is φ = 11396800.

The previous prime is 28777921. The next prime is 28777937. The reversal of 28777930 is 3977782.

28777930 = T₅₂ + T₅₃ + ... + T₅₅₆.

It can be written as a sum of positive squares in 4 ways, for example, as 28100601 + 677329 = 5301^2 + 823^2 .

It is not an unprimeable number, because it can be changed into a prime (28777937) 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, 13237 + ... + 15256.

Almost surely, 2^28777930 is an apocalyptic number.

28777930 is a deficient number, since it is larger than the sum of its proper divisors (23537054).

28777930 is a wasteful number, since it uses less digits than its factorization.

28777930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28601.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 28777930 is about 5364.5065010679. The cubic root of 28777930 is about 306.4454545726.

The spelling of 28777930 in words is "twenty-eight million, seven hundred seventy-seven thousand, nine hundred thirty".