28601978 has 4 divisors (see below), whose sum is σ = 42902970. Its totient is φ = 14300988.

The previous prime is 28601971. The next prime is 28601981. The reversal of 28601978 is 87910682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27804529 + 797449 = 5273^2 + 893^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28601971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7150493 + ... + 7150496.

Almost surely, 2^28601978 is an apocalyptic number.

28601978 is a deficient number, since it is larger than the sum of its proper divisors (14300992).

28601978 is a wasteful number, since it uses less digits than its factorization.

28601978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14300991.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28601978 is about 5348.0817121656. The cubic root of 28601978 is about 305.8196282758.

The spelling of 28601978 in words is "twenty-eight million, six hundred one thousand, nine hundred seventy-eight".