28727530 has 32 divisors (see below), whose sum is σ = 56128464. Its totient is φ = 10523136.

The previous prime is 28727519. The next prime is 28727549. The reversal of 28727530 is 3572782.

It can be written as a sum of positive squares in 8 ways, for example, as 9865881 + 18861649 = 3141^2 + 4343^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17004 + ... + 18616.

Almost surely, 2^28727530 is an apocalyptic number.

28727530 is a deficient number, since it is larger than the sum of its proper divisors (27400934).

28727530 is a wasteful number, since it uses less digits than its factorization.

28727530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28727530 is about 5359.8068995067. The cubic root of 28727530 is about 306.2664530936.

The spelling of 28727530 in words is "twenty-eight million, seven hundred twenty-seven thousand, five hundred thirty".