207828091 has 4 divisors (see below), whose sum is σ = 207873400. Its totient is φ = 207782784.

The previous prime is 207828079. The next prime is 207828109. The reversal of 207828091 is 190828702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190828702 = 2 ⋅95414351.

It is a cyclic number.

It is not a de Polignac number, because 207828091 - 2¹⁵ = 207795323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 207828091.

It is not an unprimeable number, because it can be changed into a prime (207828191) 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, 14886 + ... + 25243.

It is an arithmetic number, because the mean of its divisors is an integer number (51968350).

Almost surely, 2^207828091 is an apocalyptic number.

207828091 is a deficient number, since it is larger than the sum of its proper divisors (45309).

207828091 is an equidigital number, since it uses as much as digits as its factorization.

207828091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45308.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 207828091 is about 14416.2439976576. The cubic root of 207828091 is about 592.3359380067.

The spelling of 207828091 in words is "two hundred seven million, eight hundred twenty-eight thousand, ninety-one".