28187722 has 8 divisors (see below), whose sum is σ = 42998400. Its totient is φ = 13854924.

The previous prime is 28187699. The next prime is 28187729. The reversal of 28187722 is 22778182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28187729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119322 + ... + 119557.

It is an arithmetic number, because the mean of its divisors is an integer number (5374800).

Almost surely, 2^28187722 is an apocalyptic number.

28187722 is a deficient number, since it is larger than the sum of its proper divisors (14810678).

28187722 is a wasteful number, since it uses less digits than its factorization.

28187722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238940.

The product of its digits is 25088, while the sum is 37.

The square root of 28187722 is about 5309.2110525011. The cubic root of 28187722 is about 304.3359988228.

The spelling of 28187722 in words is "twenty-eight million, one hundred eighty-seven thousand, seven hundred twenty-two".