27728690 has 16 divisors (see below), whose sum is σ = 54449280. Its totient is φ = 10083120.

The previous prime is 27728681. The next prime is 27728707. The reversal of 27728690 is 9682772.

It is a super-2 number, since 2×27728690² = 1537760498232200, which contains 22 as substring.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 125930 + ... + 126149.

It is an arithmetic number, because the mean of its divisors is an integer number (3403080).

Almost surely, 2^27728690 is an apocalyptic number.

27728690 is a deficient number, since it is larger than the sum of its proper divisors (26720590).

27728690 is a wasteful number, since it uses less digits than its factorization.

27728690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252097.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 27728690 is about 5265.8038322748. The cubic root of 27728690 is about 302.6749301264.

The spelling of 27728690 in words is "twenty-seven million, seven hundred twenty-eight thousand, six hundred ninety".