28099394 has 4 divisors (see below), whose sum is σ = 42149094. Its totient is φ = 14049696.

The previous prime is 28099387. The next prime is 28099417. The reversal of 28099394 is 49399082.

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., 25959025 + 2140369 = 5095^2 + 1463^2 .

It is a super-3 number, since 3×28099394³ (a number of 23 digits) contains 333 as substring.

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, 7024847 + ... + 7024850.

Almost surely, 2^28099394 is an apocalyptic number.

28099394 is a deficient number, since it is larger than the sum of its proper divisors (14049700).

28099394 is a wasteful number, since it uses less digits than its factorization.

28099394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14049699.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 28099394 is about 5300.8861523334. The cubic root of 28099394 is about 304.0177808736.

The spelling of 28099394 in words is "twenty-eight million, ninety-nine thousand, three hundred ninety-four".