28919847 has 12 divisors (see below), whose sum is σ = 42384440. Its totient is φ = 17526960.

The previous prime is 28919837. The next prime is 28919851. The reversal of 28919847 is 74891982.

It is not a de Polignac number, because 28919847 - 2⁴ = 28919831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28919796 and 28919805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39472 + ... + 40197.

Almost surely, 2^28919847 is an apocalyptic number.

28919847 is a deficient number, since it is larger than the sum of its proper divisors (13464593).

28919847 is a wasteful number, since it uses less digits than its factorization.

28919847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79694 (or 79683 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 28919847 is about 5377.7176385526. The cubic root of 28919847 is about 306.9483691958.

The spelling of 28919847 in words is "twenty-eight million, nine hundred nineteen thousand, eight hundred forty-seven".