28978158 has 16 divisors (see below), whose sum is σ = 63225216. Its totient is φ = 8781240.

The previous prime is 28978151. The next prime is 28978171. The reversal of 28978158 is 85187982.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28978151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219466 + ... + 219597.

It is an arithmetic number, because the mean of its divisors is an integer number (3951576).

Almost surely, 2^28978158 is an apocalyptic number.

28978158 is an abundant number, since it is smaller than the sum of its proper divisors (34247058).

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

28978158 is a wasteful number, since it uses less digits than its factorization.

28978158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439079.

The product of its digits is 322560, while the sum is 48.

The square root of 28978158 is about 5383.1364463480. The cubic root of 28978158 is about 307.1545303864.

The spelling of 28978158 in words is "twenty-eight million, nine hundred seventy-eight thousand, one hundred fifty-eight".