28372091 has 8 divisors (see below), whose sum is σ = 30995568. Its totient is φ = 25756000.

The previous prime is 28372079. The next prime is 28372093. The reversal of 28372091 is 19027382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28372091 - 2¹⁸ = 28109947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28372093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8981 + ... + 11721.

It is an arithmetic number, because the mean of its divisors is an integer number (3874446).

Almost surely, 2^28372091 is an apocalyptic number.

28372091 is a deficient number, since it is larger than the sum of its proper divisors (2623477).

28372091 is a wasteful number, since it uses less digits than its factorization.

28372091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3693.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28372091 is about 5326.5458788975. The cubic root of 28372091 is about 304.9980865239.

The spelling of 28372091 in words is "twenty-eight million, three hundred seventy-two thousand, ninety-one".