28325978 has 8 divisors (see below), whose sum is σ = 44988372. Its totient is φ = 13329856.

The previous prime is 28325951. The next prime is 28325981. The reversal of 28325978 is 87952382.

It can be written as a sum of positive squares in 2 ways, for example, as 24433249 + 3892729 = 4943^2 + 1973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28325978² = 1604722059312968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416525 + ... + 416592.

Almost surely, 2^28325978 is an apocalyptic number.

28325978 is a deficient number, since it is larger than the sum of its proper divisors (16662394).

28325978 is a wasteful number, since it uses less digits than its factorization.

28325978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833136.

The product of its digits is 241920, while the sum is 44.

The square root of 28325978 is about 5322.2155161173. The cubic root of 28325978 is about 304.8327596981.

The spelling of 28325978 in words is "twenty-eight million, three hundred twenty-five thousand, nine hundred seventy-eight".