28380978 has 12 divisors (see below), whose sum is σ = 61492158. Its totient is φ = 9460320.

The previous prime is 28380971. The next prime is 28380983. The reversal of 28380978 is 87908382.

It can be written as a sum of positive squares in only one way, i.e., 25130169 + 3250809 = 5013^2 + 1803^2 .

It is not an unprimeable number, because it can be changed into a prime (28380971) 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, 788343 + ... + 788378.

Almost surely, 2^28380978 is an apocalyptic number.

28380978 is an abundant number, since it is smaller than the sum of its proper divisors (33111180).

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

28380978 is a wasteful number, since it uses less digits than its factorization.

28380978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576729 (or 1576726 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 28380978 is about 5327.3800314977. The cubic root of 28380978 is about 305.0299280853.

The spelling of 28380978 in words is "twenty-eight million, three hundred eighty thousand, nine hundred seventy-eight".