28072550 has 48 divisors (see below), whose sum is σ = 58335552. Its totient is φ = 9962400.

The previous prime is 28072549. The next prime is 28072567. The reversal of 28072550 is 5527082.

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 23 ways as a sum of consecutive naturals, for example, 23057 + ... + 24243.

It is an arithmetic number, because the mean of its divisors is an integer number (1215324).

Almost surely, 2^28072550 is an apocalyptic number.

28072550 is an abundant number, since it is smaller than the sum of its proper divisors (30263002).

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

28072550 is a wasteful number, since it uses less digits than its factorization.

28072550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 28072550 is about 5298.3535178393. The cubic root of 28072550 is about 303.9209382928.

The spelling of 28072550 in words is "twenty-eight million, seventy-two thousand, five hundred fifty".