28540320 has 96 divisors (see below), whose sum is σ = 92389248. Its totient is φ = 7400448.

The previous prime is 28540319. The next prime is 28540333. The reversal of 28540320 is 2304582.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 16957 + ... + 18563.

It is an arithmetic number, because the mean of its divisors is an integer number (962388).

Almost surely, 2^28540320 is an apocalyptic number.

28540320 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 28540320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46194624).

28540320 is an abundant number, since it is smaller than the sum of its proper divisors (63848928).

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

28540320 is a wasteful number, since it uses less digits than its factorization.

28540320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 28540320 is about 5342.3141053293. The cubic root of 28540320 is about 305.5997158335.

The spelling of 28540320 in words is "twenty-eight million, five hundred forty thousand, three hundred twenty".