28738791 has 12 divisors (see below), whose sum is σ = 41616120. Its totient is φ = 19110960.

The previous prime is 28738783. The next prime is 28738793. The reversal of 28738791 is 19783782.

It is not a de Polignac number, because 28738791 - 2³ = 28738783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28738793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (3468010).

Almost surely, 2^28738791 is an apocalyptic number.

28738791 is a deficient number, since it is larger than the sum of its proper divisors (12877329).

28738791 is a wasteful number, since it uses less digits than its factorization.

28738791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8046 (or 8043 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 28738791 is about 5360.8573008428. The cubic root of 28738791 is about 306.3064660008.

It can be divided in two parts, 2873 and 8791, that added together give a square (11664 = 108²).

The spelling of 28738791 in words is "twenty-eight million, seven hundred thirty-eight thousand, seven hundred ninety-one".