28978074 has 20 divisors (see below), whose sum is σ = 64932714. Its totient is φ = 9659304.

The previous prime is 28978073. The next prime is 28978099. The reversal of 28978074 is 47087982.

It can be written as a sum of positive squares in only one way, i.e., 24950025 + 4028049 = 4995^2 + 2007^2 .

It is not an unprimeable number, because it can be changed into a prime (28978073) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 89277 + ... + 89600.

Almost surely, 2^28978074 is an apocalyptic number.

28978074 is an abundant number, since it is smaller than the sum of its proper divisors (35954640).

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

28978074 is a wasteful number, since it uses less digits than its factorization.

28978074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178891 (or 178882 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 28978074 is about 5383.1286441994. The cubic root of 28978074 is about 307.1542335996.

The spelling of 28978074 in words is "twenty-eight million, nine hundred seventy-eight thousand, seventy-four".