28356530 has 8 divisors (see below), whose sum is σ = 51041772. Its totient is φ = 11342608.

The previous prime is 28356529. The next prime is 28356547. The reversal of 28356530 is 3565382.

It can be written as a sum of positive squares in 2 ways, for example, as 28334329 + 22201 = 5323^2 + 149^2 .

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

It is a Curzon number.

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, 1417817 + ... + 1417836.

Almost surely, 2^28356530 is an apocalyptic number.

28356530 is a deficient number, since it is larger than the sum of its proper divisors (22685242).

28356530 is a wasteful number, since it uses less digits than its factorization.

28356530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835660.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 28356530 is about 5325.0849758478. The cubic root of 28356530 is about 304.9423164226.

The spelling of 28356530 in words is "twenty-eight million, three hundred fifty-six thousand, five hundred thirty".