28395690 has 64 divisors (see below), whose sum is σ = 74096640. Its totient is φ = 6937920.

The previous prime is 28395677. The next prime is 28395713. The reversal of 28395690 is 9659382.

It is a super-2 number, since 2×28395690² = 1612630421152200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16867 + ... + 18473.

It is an arithmetic number, because the mean of its divisors is an integer number (1157760).

Almost surely, 2^28395690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28395690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37048320).

28395690 is an abundant number, since it is smaller than the sum of its proper divisors (45700950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28395690 is a wasteful number, since it uses less digits than its factorization.

28395690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 28395690 is about 5328.7606439021. The cubic root of 28395690 is about 305.0826256481.

The spelling of 28395690 in words is "twenty-eight million, three hundred ninety-five thousand, six hundred ninety".