28728426 has 32 divisors (see below), whose sum is σ = 60341760. Its totient is φ = 9100784.

The previous prime is 28728383. The next prime is 28728443. The reversal of 28728426 is 62482782.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24121 + ... + 25283.

It is an arithmetic number, because the mean of its divisors is an integer number (1885680).

Almost surely, 2^28728426 is an apocalyptic number.

28728426 is an abundant number, since it is smaller than the sum of its proper divisors (31613334).

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

28728426 is a wasteful number, since it uses less digits than its factorization.

28728426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370.

The product of its digits is 86016, while the sum is 39.

The square root of 28728426 is about 5359.8904839558. The cubic root of 28728426 is about 306.2696371692.

The spelling of 28728426 in words is "twenty-eight million, seven hundred twenty-eight thousand, four hundred twenty-six".