28778547 has 8 divisors (see below), whose sum is σ = 43853056. Its totient is φ = 16444872.

The previous prime is 28778531. The next prime is 28778551. The reversal of 28778547 is 74587782.

It is a happy number.

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

It is not a de Polignac number, because 28778547 - 2⁴ = 28778531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28778496 and 28778505.

It is not an unprimeable number, because it can be changed into a prime (28778587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685183 + ... + 685224.

It is an arithmetic number, because the mean of its divisors is an integer number (5481632).

Almost surely, 2^28778547 is an apocalyptic number.

28778547 is a deficient number, since it is larger than the sum of its proper divisors (15074509).

28778547 is a wasteful number, since it uses less digits than its factorization.

28778547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370417.

The product of its digits is 878080, while the sum is 48.

The square root of 28778547 is about 5364.5640083794. The cubic root of 28778547 is about 306.4476446246.

The spelling of 28778547 in words is "twenty-eight million, seven hundred seventy-eight thousand, five hundred forty-seven".