28356778 has 8 divisors (see below), whose sum is σ = 44773920. Its totient is φ = 13432140.

The previous prime is 28356773. The next prime is 28356781. The reversal of 28356778 is 87765382.

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 (28356773) by changing a digit.

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, 373078 + ... + 373153.

It is an arithmetic number, because the mean of its divisors is an integer number (5596740).

Almost surely, 2^28356778 is an apocalyptic number.

28356778 is a deficient number, since it is larger than the sum of its proper divisors (16417142).

28356778 is a wasteful number, since it uses less digits than its factorization.

28356778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746252.

The product of its digits is 564480, while the sum is 46.

The square root of 28356778 is about 5325.1082618103. The cubic root of 28356778 is about 304.9432054062.

The spelling of 28356778 in words is "twenty-eight million, three hundred fifty-six thousand, seven hundred seventy-eight".