28011394 has 4 divisors (see below), whose sum is σ = 42017094. Its totient is φ = 14005696.

The previous prime is 28011391. The next prime is 28011397. The reversal of 28011394 is 49311082.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (28011391) and next prime (28011397).

It can be written as a sum of positive squares in only one way, i.e., 27426169 + 585225 = 5237^2 + 765^2 .

It is not an unprimeable number, because it can be changed into a prime (28011391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7002847 + ... + 7002850.

Almost surely, 2^28011394 is an apocalyptic number.

28011394 is a deficient number, since it is larger than the sum of its proper divisors (14005700).

28011394 is a wasteful number, since it uses less digits than its factorization.

28011394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14005699.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28011394 is about 5292.5791444248. The cubic root of 28011394 is about 303.7000807622.

The spelling of 28011394 in words is "twenty-eight million, eleven thousand, three hundred ninety-four".