28418378 has 4 divisors (see below), whose sum is σ = 42627570. Its totient is φ = 14209188.

The previous prime is 28418359. The next prime is 28418387. The reversal of 28418378 is 87381482.

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., 17081689 + 11336689 = 4133^2 + 3367^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7104593 + ... + 7104596.

Almost surely, 2^28418378 is an apocalyptic number.

28418378 is a deficient number, since it is larger than the sum of its proper divisors (14209192).

28418378 is a wasteful number, since it uses less digits than its factorization.

28418378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14209191.

The product of its digits is 86016, while the sum is 41.

The square root of 28418378 is about 5330.8890440526. The cubic root of 28418378 is about 305.1638571302.

The spelling of 28418378 in words is "twenty-eight million, four hundred eighteen thousand, three hundred seventy-eight".