28727040 has 72 divisors (see below), whose sum is σ = 91759248. Its totient is φ = 7659520.

The previous prime is 28727029. The next prime is 28727057. The reversal of 28727040 is 4072782.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28726989 and 28727007.

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 7 ways as a sum of consecutive naturals, for example, 100 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (1274434).

Almost surely, 2^28727040 is an apocalyptic number.

28727040 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 28727040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45879624).

28727040 is an abundant number, since it is smaller than the sum of its proper divisors (63032208).

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

28727040 is an equidigital number, since it uses as much as digits as its factorization.

28727040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7505 (or 7491 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 28727040 is about 5359.7611887098. The cubic root of 28727040 is about 306.2647117742.

The spelling of 28727040 in words is "twenty-eight million, seven hundred twenty-seven thousand, forty".