28866720 has 48 divisors (see below), whose sum is σ = 90931680. Its totient is φ = 7697664.

The previous prime is 28866713. The next prime is 28866727. The reversal of 28866720 is 2766882.

It is an interprime number because it is at equal distance from previous prime (28866713) and next prime (28866727).

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28866727) by changing a digit.

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, 29590 + ... + 30549.

It is an arithmetic number, because the mean of its divisors is an integer number (1894410).

Almost surely, 2^28866720 is an apocalyptic number.

28866720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28866720 is an abundant number, since it is smaller than the sum of its proper divisors (62064960).

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

28866720 is a wasteful number, since it uses less digits than its factorization.

28866720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60157 (or 60149 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 28866720 is about 5372.7758188854. The cubic root of 28866720 is about 306.7602948730.

The spelling of 28866720 in words is "twenty-eight million, eight hundred sixty-six thousand, seven hundred twenty".