28661315 has 8 divisors (see below), whose sum is σ = 34976880. Its totient is φ = 22540192.

The previous prime is 28661257. The next prime is 28661317. The reversal of 28661315 is 51316682.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28661315 - 2²⁴ = 11884099 is a prime.

It is a super-3 number, since 3×28661315³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28661317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48284 + ... + 48873.

It is an arithmetic number, because the mean of its divisors is an integer number (4372110).

Almost surely, 2^28661315 is an apocalyptic number.

28661315 is a deficient number, since it is larger than the sum of its proper divisors (6315565).

28661315 is an equidigital number, since it uses as much as digits as its factorization.

28661315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97221.

The product of its digits is 8640, while the sum is 32.

The square root of 28661315 is about 5353.6263410888. The cubic root of 28661315 is about 306.0309643008.

Adding to 28661315 its reverse (51316682), we get a palindrome (79977997).

The spelling of 28661315 in words is "twenty-eight million, six hundred sixty-one thousand, three hundred fifteen".