28385978 has 8 divisors (see below), whose sum is σ = 42610260. Its totient is φ = 14182560.

The previous prime is 28385969. The next prime is 28386031. The reversal of 28385978 is 87958382.

It can be written as a sum of positive squares in 2 ways, for example, as 24373969 + 4012009 = 4937^2 + 2003^2 .

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, 1193 + ... + 7628.

Almost surely, 2^28385978 is an apocalyptic number.

28385978 is a deficient number, since it is larger than the sum of its proper divisors (14224282).

28385978 is a wasteful number, since it uses less digits than its factorization.

28385978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10432.

The product of its digits is 967680, while the sum is 50.

The square root of 28385978 is about 5327.8492846551. The cubic root of 28385978 is about 305.0478398487.

The spelling of 28385978 in words is "twenty-eight million, three hundred eighty-five thousand, nine hundred seventy-eight".