28002720 has 96 divisors (see below), whose sum is σ = 88941888. Its totient is φ = 7405568.

The previous prime is 28002671. The next prime is 28002743. The reversal of 28002720 is 2720082.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 108832 + ... + 109088.

It is an arithmetic number, because the mean of its divisors is an integer number (926478).

Almost surely, 2^28002720 is an apocalyptic number.

28002720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28002720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44470944).

28002720 is an abundant number, since it is smaller than the sum of its proper divisors (60939168).

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

28002720 is a wasteful number, since it uses less digits than its factorization.

28002720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 28002720 is about 5291.7596317293. The cubic root of 28002720 is about 303.6687296335.

The spelling of 28002720 in words is "twenty-eight million, two thousand, seven hundred twenty".