28243378 has 4 divisors (see below), whose sum is σ = 42365070. Its totient is φ = 14121688.

The previous prime is 28243357. The next prime is 28243417. The reversal of 28243378 is 87334282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28015849 + 227529 = 5293^2 + 477^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7060843 + ... + 7060846.

Almost surely, 2^28243378 is an apocalyptic number.

28243378 is a deficient number, since it is larger than the sum of its proper divisors (14121692).

28243378 is a wasteful number, since it uses less digits than its factorization.

28243378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14121691.

The product of its digits is 64512, while the sum is 37.

The square root of 28243378 is about 5314.4499244983. The cubic root of 28243378 is about 304.5361685822.

It can be divided in two parts, 282 and 43378, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 28243378 in words is "twenty-eight million, two hundred forty-three thousand, three hundred seventy-eight".