28775544 has 48 divisors (see below), whose sum is σ = 83687400. Its totient is φ = 8221248.

The previous prime is 28775521. The next prime is 28775573. The reversal of 28775544 is 44557782.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 28775496 and 28775505.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 11059 + ... + 13410.

Almost surely, 2^28775544 is an apocalyptic number.

28775544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28775544 is an abundant number, since it is smaller than the sum of its proper divisors (54911856).

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

28775544 is a wasteful number, since it uses less digits than its factorization.

28775544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24492 (or 24481 counting only the distinct ones).

The product of its digits is 313600, while the sum is 42.

The square root of 28775544 is about 5364.2841088071. The cubic root of 28775544 is about 306.4369851302.

The spelling of 28775544 in words is "twenty-eight million, seven hundred seventy-five thousand, five hundred forty-four".