28264720 has 40 divisors (see below), whose sum is σ = 71691840. Its totient is φ = 10277760.

The previous prime is 28264697. The next prime is 28264751. The reversal of 28264720 is 2746282.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15180 + ... + 16939.

It is an arithmetic number, because the mean of its divisors is an integer number (1792296).

Almost surely, 2^28264720 is an apocalyptic number.

28264720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28264720 is an abundant number, since it is smaller than the sum of its proper divisors (43427120).

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

28264720 is a wasteful number, since it uses less digits than its factorization.

28264720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32143 (or 32137 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 28264720 is about 5316.4574671486. The cubic root of 28264720 is about 304.6128564641.

The spelling of 28264720 in words is "twenty-eight million, two hundred sixty-four thousand, seven hundred twenty".