28739775 has 24 divisors (see below), whose sum is σ = 50313744. Its totient is φ = 14425600.

The previous prime is 28739749. The next prime is 28739797. The reversal of 28739775 is 57793782.

It is not a de Polignac number, because 28739775 - 2⁵ = 28739743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9996 + ... + 12545.

It is an arithmetic number, because the mean of its divisors is an integer number (2096406).

Almost surely, 2^28739775 is an apocalyptic number.

28739775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28739775 is a deficient number, since it is larger than the sum of its proper divisors (21573969).

28739775 is a wasteful number, since it uses less digits than its factorization.

28739775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22571 (or 22566 counting only the distinct ones).

The product of its digits is 740880, while the sum is 48.

The square root of 28739775 is about 5360.9490764229. The cubic root of 28739775 is about 306.3099618812.

The spelling of 28739775 in words is "twenty-eight million, seven hundred thirty-nine thousand, seven hundred seventy-five".