28749797 has 8 divisors (see below), whose sum is σ = 29393280. Its totient is φ = 28110160.

The previous prime is 28749719. The next prime is 28749811. The reversal of 28749797 is 79794782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28749797 - 2⁸ = 28749541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28749197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18272 + ... + 19782.

It is an arithmetic number, because the mean of its divisors is an integer number (3674160).

Almost surely, 2^28749797 is an apocalyptic number.

It is an amenable number.

28749797 is a deficient number, since it is larger than the sum of its proper divisors (643483).

28749797 is a wasteful number, since it uses less digits than its factorization.

28749797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923.

The product of its digits is 1778112, while the sum is 53.

The square root of 28749797 is about 5361.8837175008. The cubic root of 28749797 is about 306.3455627360.

The spelling of 28749797 in words is "twenty-eight million, seven hundred forty-nine thousand, seven hundred ninety-seven".