28847978 has 8 divisors (see below), whose sum is σ = 43793568. Its totient is φ = 14250124.

The previous prime is 28847977. The next prime is 28847981. The reversal of 28847978 is 87974882.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (28847971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86726 + ... + 87057.

It is an arithmetic number, because the mean of its divisors is an integer number (5474196).

Almost surely, 2^28847978 is an apocalyptic number.

28847978 is a deficient number, since it is larger than the sum of its proper divisors (14945590).

28847978 is a wasteful number, since it uses less digits than its factorization.

28847978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173868.

The product of its digits is 1806336, while the sum is 53.

The square root of 28847978 is about 5371.0313720923. The cubic root of 28847978 is about 306.6938914603.

The spelling of 28847978 in words is "twenty-eight million, eight hundred forty-seven thousand, nine hundred seventy-eight".