28357791 has 16 divisors (see below), whose sum is σ = 47140608. Its totient is φ = 14731200.

The previous prime is 28357789. The next prime is 28357793. The reversal of 28357791 is 19775382.

It is an interprime number because it is at equal distance from previous prime (28357789) and next prime (28357793).

It is not a de Polignac number, because 28357791 - 2¹ = 28357789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28357793) 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, 61150 + ... + 61611.

It is an arithmetic number, because the mean of its divisors is an integer number (2946288).

Almost surely, 2^28357791 is an apocalyptic number.

28357791 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28357791 is a deficient number, since it is larger than the sum of its proper divisors (18782817).

28357791 is a wasteful number, since it uses less digits than its factorization.

28357791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122782.

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

The square root of 28357791 is about 5325.2033763979. The cubic root of 28357791 is about 304.9468365638.

The spelling of 28357791 in words is "twenty-eight million, three hundred fifty-seven thousand, seven hundred ninety-one".