28061919 has 6 divisors (see below), whose sum is σ = 40533896. Its totient is φ = 18707940.

The previous prime is 28061897. The next prime is 28061923. The reversal of 28061919 is 91916082.

28061919 is a `hidden beast` number, since 28 + 0 + 619 + 19 = 666.

It is not a de Polignac number, because 28061919 - 2¹⁵ = 28029151 is a prime.

It is a super-2 number, since 2×28061919² = 1574942595925122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1558987 + ... + 1559004.

Almost surely, 2^28061919 is an apocalyptic number.

28061919 is a deficient number, since it is larger than the sum of its proper divisors (12471977).

28061919 is a wasteful number, since it uses less digits than its factorization.

28061919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117997 (or 3117994 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 28061919 is about 5297.3501866499. The cubic root of 28061919 is about 303.8825687653.

The spelling of 28061919 in words is "twenty-eight million, sixty-one thousand, nine hundred nineteen".