28890345 has 32 divisors (see below), whose sum is σ = 50678784. Its totient is φ = 13937600.

The previous prime is 28890311. The next prime is 28890349. The reversal of 28890345 is 54309882.

It is a happy number.

It is not a de Polignac number, because 28890345 - 2¹¹ = 28888297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28890349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51034 + ... + 51596.

It is an arithmetic number, because the mean of its divisors is an integer number (1583712).

Almost surely, 2^28890345 is an apocalyptic number.

It is an amenable number.

28890345 is a deficient number, since it is larger than the sum of its proper divisors (21788439).

28890345 is a wasteful number, since it uses less digits than its factorization.

28890345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 28890345 is about 5374.9739534253. The cubic root of 28890345 is about 306.8439579492.

The spelling of 28890345 in words is "twenty-eight million, eight hundred ninety thousand, three hundred forty-five".