28379091 has 32 divisors (see below), whose sum is σ = 42219520. Its totient is φ = 16848000.

The previous prime is 28379089. The next prime is 28379161. The reversal of 28379091 is 19097382.

It is not a de Polignac number, because 28379091 - 2¹ = 28379089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28379041) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 187866 + ... + 188016.

It is an arithmetic number, because the mean of its divisors is an integer number (1319360).

Almost surely, 2^28379091 is an apocalyptic number.

28379091 is a deficient number, since it is larger than the sum of its proper divisors (13840429).

28379091 is a wasteful number, since it uses less digits than its factorization.

28379091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 28379091 is about 5327.2029246125. The cubic root of 28379091 is about 305.0231676391.

It can be divided in two parts, 283790 and 91, that added together give a triangular number (283881 = T₇₅₃).

The spelling of 28379091 in words is "twenty-eight million, three hundred seventy-nine thousand, ninety-one".