28012919 has 16 divisors (see below), whose sum is σ = 32085504. Its totient is φ = 24208800.

The previous prime is 28012913. The next prime is 28012939. The reversal of 28012919 is 91921082.

It is a happy number.

It is not a de Polignac number, because 28012919 - 2⁴ = 28012903 is a prime.

It is a super-2 number, since 2×28012919² = 1569447261801122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28012913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66329 + ... + 66749.

It is an arithmetic number, because the mean of its divisors is an integer number (2005344).

Almost surely, 2^28012919 is an apocalyptic number.

28012919 is a deficient number, since it is larger than the sum of its proper divisors (4072585).

28012919 is a wasteful number, since it uses less digits than its factorization.

28012919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 28012919 is about 5292.7232121092. The cubic root of 28012919 is about 303.7055920221.

The spelling of 28012919 in words is "twenty-eight million, twelve thousand, nine hundred nineteen".