28188746 has 8 divisors (see below), whose sum is σ = 43426020. Its totient is φ = 13713408.

The previous prime is 28188697. The next prime is 28188757. The reversal of 28188746 is 64788182.

It can be written as a sum of positive squares in 2 ways, for example, as 20839225 + 7349521 = 4565^2 + 2711^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28188697 and 28188706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190391 + ... + 190538.

Almost surely, 2^28188746 is an apocalyptic number.

28188746 is a deficient number, since it is larger than the sum of its proper divisors (15237274).

28188746 is a wasteful number, since it uses less digits than its factorization.

28188746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380968.

The product of its digits is 172032, while the sum is 44.

The square root of 28188746 is about 5309.3074877991. The cubic root of 28188746 is about 304.3396840714.

The spelling of 28188746 in words is "twenty-eight million, one hundred eighty-eight thousand, seven hundred forty-six".