28347690 has 32 divisors (see below), whose sum is σ = 77754240. Its totient is φ = 6479424.

The previous prime is 28347667. The next prime is 28347719. The reversal of 28347690 is 9674382.

It is a super-2 number, since 2×28347690² = 1607183056672200, 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 15 ways as a sum of consecutive naturals, for example, 67285 + ... + 67704.

It is an arithmetic number, because the mean of its divisors is an integer number (2429820).

Almost surely, 2^28347690 is an apocalyptic number.

28347690 is an abundant number, since it is smaller than the sum of its proper divisors (49406550).

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

28347690 is a wasteful number, since it uses less digits than its factorization.

28347690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135006.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 28347690 is about 5324.2548774453. The cubic root of 28347690 is about 304.9106250714.

The spelling of 28347690 in words is "twenty-eight million, three hundred forty-seven thousand, six hundred ninety".