28749456 has 60 divisors (see below), whose sum is σ = 82347408. Its totient is φ = 9358272.

The previous prime is 28749449. The next prime is 28749467. The reversal of 28749456 is 65494782.

It is a happy number.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3871 + ... + 8513.

Almost surely, 2^28749456 is an apocalyptic number.

28749456 is the 3096-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28749456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41173704).

28749456 is an abundant number, since it is smaller than the sum of its proper divisors (53597952).

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

28749456 is a wasteful number, since it uses less digits than its factorization.

28749456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700 (or 4691 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28749456 is about 5361.8519188803. The cubic root of 28749456 is about 306.3443515477.

The spelling of 28749456 in words is "twenty-eight million, seven hundred forty-nine thousand, four hundred fifty-six".