28778674 has 8 divisors (see below), whose sum is σ = 44334828. Its totient is φ = 14000400.

The previous prime is 28778669. The next prime is 28778677. The reversal of 28778674 is 47687782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28697449 + 81225 = 5357^2 + 285^2 .

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 (28778677) 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, 194377 + ... + 194524.

Almost surely, 2^28778674 is an apocalyptic number.

28778674 is a deficient number, since it is larger than the sum of its proper divisors (15556154).

28778674 is a wasteful number, since it uses less digits than its factorization.

28778674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388940.

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

The square root of 28778674 is about 5364.5758453022. The cubic root of 28778674 is about 306.4480954094.

It can be divided in two parts, 287 and 78674, that added together give a square (78961 = 281²).

The spelling of 28778674 in words is "twenty-eight million, seven hundred seventy-eight thousand, six hundred seventy-four".