28177725 has 12 divisors (see below), whose sum is σ = 46587296. Its totient is φ = 15028080.

The previous prime is 28177697. The next prime is 28177733. The reversal of 28177725 is 52777182.

It is not a de Polignac number, because 28177725 - 2⁶ = 28177661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187777 + ... + 187926.

Almost surely, 2^28177725 is an apocalyptic number.

28177725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28177725 is a deficient number, since it is larger than the sum of its proper divisors (18409571).

28177725 is a wasteful number, since it uses less digits than its factorization.

28177725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375716 (or 375711 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 28177725 is about 5308.2694920285. The cubic root of 28177725 is about 304.3000161738.

The spelling of 28177725 in words is "twenty-eight million, one hundred seventy-seven thousand, seven hundred twenty-five".