28449730 has 8 divisors (see below), whose sum is σ = 51209532. Its totient is φ = 11379888.

The previous prime is 28449727. The next prime is 28449731. The reversal of 28449730 is 3794482.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25411681 + 3038049 = 5041^2 + 1743^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28449730.

It is not an unprimeable number, because it can be changed into a prime (28449731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1422477 + ... + 1422496.

Almost surely, 2^28449730 is an apocalyptic number.

28449730 is a deficient number, since it is larger than the sum of its proper divisors (22759802).

28449730 is a wasteful number, since it uses less digits than its factorization.

28449730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844980.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28449730 is about 5333.8288311493. The cubic root of 28449730 is about 305.2760378350.

The spelling of 28449730 in words is "twenty-eight million, four hundred forty-nine thousand, seven hundred thirty".