28757278 has 16 divisors (see below), whose sum is σ = 47205504. Its totient is φ = 13030360.

The previous prime is 28757269. The next prime is 28757297. The reversal of 28757278 is 87275782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5751 + ... + 9517.

It is an arithmetic number, because the mean of its divisors is an integer number (2950344).

Almost surely, 2^28757278 is an apocalyptic number.

28757278 is a deficient number, since it is larger than the sum of its proper divisors (18448226).

28757278 is a wasteful number, since it uses less digits than its factorization.

28757278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4127.

The product of its digits is 439040, while the sum is 46.

The square root of 28757278 is about 5362.5812814353. The cubic root of 28757278 is about 306.3721318790.

It can be divided in two parts, 2875 and 7278, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 28757278 in words is "twenty-eight million, seven hundred fifty-seven thousand, two hundred seventy-eight".