28726560 has 72 divisors (see below), whose sum is σ = 98034300. Its totient is φ = 7660032.

The previous prime is 28726543. The next prime is 28726567. The reversal of 28726560 is 6562782.

28726560 is a `hidden beast` number, since 28 + 72 + 6 + 560 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26255376 + 2471184 = 5124^2 + 1572^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28726567) 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 11 ways as a sum of consecutive naturals, for example, 8535 + ... + 11414.

Almost surely, 2^28726560 is an apocalyptic number.

28726560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28726560 is an abundant number, since it is smaller than the sum of its proper divisors (69307740).

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

28726560 is a wasteful number, since it uses less digits than its factorization.

28726560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19970 (or 19959 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 28726560 is about 5359.7164104083. The cubic root of 28726560 is about 306.2630059727.

The spelling of 28726560 in words is "twenty-eight million, seven hundred twenty-six thousand, five hundred sixty".