28552978 has 4 divisors (see below), whose sum is σ = 42829470. Its totient is φ = 14276488.

The previous prime is 28552973. The next prime is 28552981. The reversal of 28552978 is 87925582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87925582 = 2 ⋅43962791.

It can be written as a sum of positive squares in only one way, i.e., 28547649 + 5329 = 5343^2 + 73^2 .

It is not an unprimeable number, because it can be changed into a prime (28552973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7138243 + ... + 7138246.

Almost surely, 2^28552978 is an apocalyptic number.

28552978 is a deficient number, since it is larger than the sum of its proper divisors (14276492).

28552978 is a wasteful number, since it uses less digits than its factorization.

28552978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14276491.

The product of its digits is 403200, while the sum is 46.

The square root of 28552978 is about 5343.4986666041. The cubic root of 28552978 is about 305.6448882944.

The spelling of 28552978 in words is "twenty-eight million, five hundred fifty-two thousand, nine hundred seventy-eight".