8749428 has 24 divisors (see below), whose sum is σ = 20620320. Its totient is φ = 2887200.

The previous prime is 8749423. The next prime is 8749439. The reversal of 8749428 is 8249478.

It is a self number, because there is not a number n which added to its sum of digits gives 8749428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8749421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2398 + ... + 4821.

It is an arithmetic number, because the mean of its divisors is an integer number (859180).

Almost surely, 2^8749428 is an apocalyptic number.

It is an amenable number.

8749428 is an abundant number, since it is smaller than the sum of its proper divisors (11870892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8749428 is a wasteful number, since it uses less digits than its factorization.

8749428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7327 (or 7325 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 8749428 is about 2957.9432043229. The cubic root of 8749428 is about 206.0597746541.

The spelling of 8749428 in words is "eight million, seven hundred forty-nine thousand, four hundred twenty-eight".