28757458 has 4 divisors (see below), whose sum is σ = 43136190. Its totient is φ = 14378728.

The previous prime is 28757453. The next prime is 28757459. The reversal of 28757458 is 85475782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26142769 + 2614689 = 5113^2 + 1617^2 .

It is not an unprimeable number, because it can be changed into a prime (28757453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7189363 + ... + 7189366.

Almost surely, 2^28757458 is an apocalyptic number.

28757458 is a deficient number, since it is larger than the sum of its proper divisors (14378732).

28757458 is a wasteful number, since it uses less digits than its factorization.

28757458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14378731.

The product of its digits is 627200, while the sum is 46.

The square root of 28757458 is about 5362.5980643714. The cubic root of 28757458 is about 306.3727711012.

The spelling of 28757458 in words is "twenty-eight million, seven hundred fifty-seven thousand, four hundred fifty-eight".