28724450 has 12 divisors (see below), whose sum is σ = 53427570. Its totient is φ = 11489760.

The previous prime is 28724429. The next prime is 28724459. The reversal of 28724450 is 5442782.

It can be written as a sum of positive squares in 3 ways, for example, as 18567481 + 10156969 = 4309^2 + 3187^2 .

It is not an unprimeable number, because it can be changed into a prime (28724459) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 287195 + ... + 287294.

Almost surely, 2^28724450 is an apocalyptic number.

28724450 is a deficient number, since it is larger than the sum of its proper divisors (24703120).

28724450 is a wasteful number, since it uses less digits than its factorization.

28724450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574501 (or 574496 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 28724450 is about 5359.5195680210. The cubic root of 28724450 is about 306.2555073284.

The spelling of 28724450 in words is "twenty-eight million, seven hundred twenty-four thousand, four hundred fifty".