26428591 has 12 divisors (see below), whose sum is σ = 32552928. Its totient is φ = 21319872.

The previous prime is 26428583. The next prime is 26428603. The reversal of 26428591 is 19582462.

It is not a de Polignac number, because 26428591 - 2³ = 26428583 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 26428591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26428511) 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 11 ways as a sum of consecutive naturals, for example, 15031 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (2712744).

Almost surely, 2^26428591 is an apocalyptic number.

26428591 is a deficient number, since it is larger than the sum of its proper divisors (6124337).

26428591 is a wasteful number, since it uses less digits than its factorization.

26428591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31758 (or 31751 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 26428591 is about 5140.8745364967. The cubic root of 26428591 is about 297.8685628191.

The spelling of 26428591 in words is "twenty-six million, four hundred twenty-eight thousand, five hundred ninety-one".