28615978 has 8 divisors (see below), whose sum is σ = 43087968. Its totient is φ = 14253324.

The previous prime is 28615967. The next prime is 28615999. The reversal of 28615978 is 87951682.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26676 + ... + 27727.

It is an arithmetic number, because the mean of its divisors is an integer number (5385996).

Almost surely, 2^28615978 is an apocalyptic number.

28615978 is a deficient number, since it is larger than the sum of its proper divisors (14471990).

28615978 is a wasteful number, since it uses less digits than its factorization.

28615978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54668.

The product of its digits is 241920, while the sum is 46.

The square root of 28615978 is about 5349.3904325633. The cubic root of 28615978 is about 305.8695173245.

The spelling of 28615978 in words is "twenty-eight million, six hundred fifteen thousand, nine hundred seventy-eight".