28161386 has 16 divisors (see below), whose sum is σ = 46180800. Its totient is φ = 12773280.

The previous prime is 28161359. The next prime is 28161389. The reversal of 28161386 is 68316182.

It is a super-2 number, since 2×28161386² = 1586127322881992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28161389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12110 + ... + 14246.

It is an arithmetic number, because the mean of its divisors is an integer number (2886300).

Almost surely, 2^28161386 is an apocalyptic number.

28161386 is a deficient number, since it is larger than the sum of its proper divisors (18019414).

28161386 is a wasteful number, since it uses less digits than its factorization.

28161386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749.

The product of its digits is 13824, while the sum is 35.

The square root of 28161386 is about 5306.7302550629. The cubic root of 28161386 is about 304.2411881541.

The spelling of 28161386 in words is "twenty-eight million, one hundred sixty-one thousand, three hundred eighty-six".