28577480 has 32 divisors (see below), whose sum is σ = 64490040. Its totient is φ = 11397120.

The previous prime is 28577473. The next prime is 28577489. The reversal of 28577480 is 8477582.

It can be written as a sum of positive squares in 4 ways, for example, as 21362884 + 7214596 = 4622^2 + 2686^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28577489) 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, 15992 + ... + 17688.

Almost surely, 2^28577480 is an apocalyptic number.

28577480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28577480 is an abundant number, since it is smaller than the sum of its proper divisors (35912560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28577480 is a wasteful number, since it uses less digits than its factorization.

28577480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 28577480 is about 5345.7908675892. The cubic root of 28577480 is about 305.7322903853.

The spelling of 28577480 in words is "twenty-eight million, five hundred seventy-seven thousand, four hundred eighty".