28773591 has 16 divisors (see below), whose sum is σ = 47831808. Its totient is φ = 14947200.

The previous prime is 28773553. The next prime is 28773601. The reversal of 28773591 is 19537782.

It is not a de Polignac number, because 28773591 - 2⁹ = 28773079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28773551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62050 + ... + 62511.

It is an arithmetic number, because the mean of its divisors is an integer number (2989488).

Almost surely, 2^28773591 is an apocalyptic number.

28773591 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28773591 is a deficient number, since it is larger than the sum of its proper divisors (19058217).

28773591 is a wasteful number, since it uses less digits than its factorization.

28773591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124582.

The product of its digits is 105840, while the sum is 42.

The square root of 28773591 is about 5364.1020683801. The cubic root of 28773591 is about 306.4300523337.

The spelling of 28773591 in words is "twenty-eight million, seven hundred seventy-three thousand, five hundred ninety-one".