28206690 has 16 divisors (see below), whose sum is σ = 67696128. Its totient is φ = 7521776.

The previous prime is 28206643. The next prime is 28206701. The reversal of 28206690 is 9660282.

It is a super-2 number, since 2×28206690² = 1591234721512200, which contains 22 as substring.

It is an unprimeable number.

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, 470082 + ... + 470141.

It is an arithmetic number, because the mean of its divisors is an integer number (4231008).

Almost surely, 2^28206690 is an apocalyptic number.

28206690 is an abundant number, since it is smaller than the sum of its proper divisors (39489438).

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

28206690 is a wasteful number, since it uses less digits than its factorization.

28206690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940233.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28206690 is about 5310.9970815281. The cubic root of 28206690 is about 304.4042478152.

The spelling of 28206690 in words is "twenty-eight million, two hundred six thousand, six hundred ninety".