28746778 has 8 divisors (see below), whose sum is σ = 43179840. Its totient is φ = 14353500.

The previous prime is 28746769. The next prime is 28746811. The reversal of 28746778 is 87764782.

It is a happy number.

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, 8068 + ... + 11071.

It is an arithmetic number, because the mean of its divisors is an integer number (5397480).

Almost surely, 2^28746778 is an apocalyptic number.

28746778 is a deficient number, since it is larger than the sum of its proper divisors (14433062).

28746778 is a wasteful number, since it uses less digits than its factorization.

28746778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19892.

The product of its digits is 1053696, while the sum is 49.

The square root of 28746778 is about 5361.6021859142. The cubic root of 28746778 is about 306.3348393023.

The spelling of 28746778 in words is "twenty-eight million, seven hundred forty-six thousand, seven hundred seventy-eight".