28909458 has 12 divisors (see below), whose sum is σ = 62637198. Its totient is φ = 9636480.

The previous prime is 28909451. The next prime is 28909471. The reversal of 28909458 is 85490982.

It can be written as a sum of positive squares in only one way, i.e., 22724289 + 6185169 = 4767^2 + 2487^2 .

It is not an unprimeable number, because it can be changed into a prime (28909451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 803023 + ... + 803058.

Almost surely, 2^28909458 is an apocalyptic number.

28909458 is an abundant number, since it is smaller than the sum of its proper divisors (33727740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28909458 is a wasteful number, since it uses less digits than its factorization.

28909458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606089 (or 1606086 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 28909458 is about 5376.7516215648. The cubic root of 28909458 is about 306.9116093363.

The spelling of 28909458 in words is "twenty-eight million, nine hundred nine thousand, four hundred fifty-eight".