28191514 has 16 divisors (see below), whose sum is σ = 47521152. Its totient is φ = 12445488.

The previous prime is 28191467. The next prime is 28191517. The reversal of 28191514 is 41519182.

It is a happy number.

It is a super-2 number, since 2×28191514² = 1589522923224392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28191517) 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 in 7 ways as a sum of consecutive naturals, for example, 22974 + ... + 24169.

It is an arithmetic number, because the mean of its divisors is an integer number (2970072).

Almost surely, 2^28191514 is an apocalyptic number.

28191514 is a deficient number, since it is larger than the sum of its proper divisors (19329638).

28191514 is a wasteful number, since it uses less digits than its factorization.

28191514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47181.

The product of its digits is 2880, while the sum is 31.

The square root of 28191514 is about 5309.5681556978. The cubic root of 28191514 is about 304.3496453124.

The spelling of 28191514 in words is "twenty-eight million, one hundred ninety-one thousand, five hundred fourteen".