28200394 has 4 divisors (see below), whose sum is σ = 42300594. Its totient is φ = 14100196.

The previous prime is 28200379. The next prime is 28200409. The reversal of 28200394 is 49300282.

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 (28200379) and next prime (28200409).

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 7634169 = 4535^2 + 2763^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7050097 + ... + 7050100.

Almost surely, 2^28200394 is an apocalyptic number.

28200394 is a deficient number, since it is larger than the sum of its proper divisors (14100200).

28200394 is a wasteful number, since it uses less digits than its factorization.

28200394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14100199.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28200394 is about 5310.4043160573. The cubic root of 28200394 is about 304.3815974941.

The spelling of 28200394 in words is "twenty-eight million, two hundred thousand, three hundred ninety-four".