28856890 has 8 divisors (see below), whose sum is σ = 51942420. Its totient is φ = 11542752.

The previous prime is 28856887. The next prime is 28856897. The reversal of 28856890 is 9865882.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28483569 + 373321 = 5337^2 + 611^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28856890.

It is not an unprimeable number, because it can be changed into a prime (28856897) 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, 1442835 + ... + 1442854.

Almost surely, 2^28856890 is an apocalyptic number.

28856890 is a deficient number, since it is larger than the sum of its proper divisors (23085530).

28856890 is a wasteful number, since it uses less digits than its factorization.

28856890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885696.

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 28856890 is about 5371.8609438443. The cubic root of 28856890 is about 306.7254705026.

The spelling of 28856890 in words is "twenty-eight million, eight hundred fifty-six thousand, eight hundred ninety".