28749679 has 24 divisors (see below), whose sum is σ = 35893248. Its totient is φ = 22530960.

The previous prime is 28749649. The next prime is 28749689. The reversal of 28749679 is 97694782.

It is a de Polignac number, because none of the positive numbers 2^k-28749679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28749619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78154 + ... + 78520.

It is an arithmetic number, because the mean of its divisors is an integer number (1495552).

Almost surely, 2^28749679 is an apocalyptic number.

28749679 is a deficient number, since it is larger than the sum of its proper divisors (7143569).

28749679 is a wasteful number, since it uses less digits than its factorization.

28749679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 424 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 52.

The square root of 28749679 is about 5361.8727138939. The cubic root of 28749679 is about 306.3451436162.

The spelling of 28749679 in words is "twenty-eight million, seven hundred forty-nine thousand, six hundred seventy-nine".