28775550 has 24 divisors (see below), whose sum is σ = 71363736. Its totient is φ = 7673440.

The previous prime is 28775521. The next prime is 28775573. The reversal of 28775550 is 5557782.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28775499 and 28775508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95769 + ... + 96068.

It is an arithmetic number, because the mean of its divisors is an integer number (2973489).

Almost surely, 2^28775550 is an apocalyptic number.

28775550 is an abundant number, since it is smaller than the sum of its proper divisors (42588186).

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

28775550 is a wasteful number, since it uses less digits than its factorization.

28775550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191852 (or 191847 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 28775550 is about 5364.2846680615. The cubic root of 28775550 is about 306.4370064286.

The spelling of 28775550 in words is "twenty-eight million, seven hundred seventy-five thousand, five hundred fifty".