28724026 has 8 divisors (see below), whose sum is σ = 44137044. Its totient is φ = 14011680.

The previous prime is 28724009. The next prime is 28724027. The reversal of 28724026 is 62042782.

It can be written as a sum of positive squares in 2 ways, for example, as 28611801 + 112225 = 5349^2 + 335^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28724027) 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, 175065 + ... + 175228.

Almost surely, 2^28724026 is an apocalyptic number.

28724026 is a deficient number, since it is larger than the sum of its proper divisors (15413018).

28724026 is a wasteful number, since it uses less digits than its factorization.

28724026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350336.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 28724026 is about 5359.4800120907. The cubic root of 28724026 is about 306.2540004475.

The spelling of 28724026 in words is "twenty-eight million, seven hundred twenty-four thousand, twenty-six".