28342978 has 8 divisors (see below), whose sum is σ = 45015372. Its totient is φ = 13337856.

The previous prime is 28342967. The next prime is 28343009. The reversal of 28342978 is 87924382.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28334329 + 8649 = 5323^2 + 93^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416775 + ... + 416842.

Almost surely, 2^28342978 is an apocalyptic number.

28342978 is a deficient number, since it is larger than the sum of its proper divisors (16672394).

28342978 is a wasteful number, since it uses less digits than its factorization.

28342978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833636.

The product of its digits is 193536, while the sum is 43.

The square root of 28342978 is about 5323.8123558217. The cubic root of 28342978 is about 304.8937298855.

The spelling of 28342978 in words is "twenty-eight million, three hundred forty-two thousand, nine hundred seventy-eight".