28458530 has 8 divisors (see below), whose sum is σ = 51225372. Its totient is φ = 11383408.

The previous prime is 28458491. The next prime is 28458533. The reversal of 28458530 is 3585482.

It can be written as a sum of positive squares in 2 ways, for example, as 23319241 + 5139289 = 4829^2 + 2267^2 .

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 (28458533) 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, 1422917 + ... + 1422936.

Almost surely, 2^28458530 is an apocalyptic number.

28458530 is a deficient number, since it is larger than the sum of its proper divisors (22766842).

28458530 is a wasteful number, since it uses less digits than its factorization.

28458530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845860.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 28458530 is about 5334.6536907282. The cubic root of 28458530 is about 305.3075103328.

The spelling of 28458530 in words is "twenty-eight million, four hundred fifty-eight thousand, five hundred thirty".