28746439 has 4 divisors (see below), whose sum is σ = 30437424. Its totient is φ = 27055456.

The previous prime is 28746427. The next prime is 28746463. The reversal of 28746439 is 93464782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28746439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28746395 and 28746404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28746499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 845467 + ... + 845500.

It is an arithmetic number, because the mean of its divisors is an integer number (7609356).

Almost surely, 2^28746439 is an apocalyptic number.

28746439 is a deficient number, since it is larger than the sum of its proper divisors (1690985).

28746439 is a wasteful number, since it uses less digits than its factorization.

28746439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690984.

The product of its digits is 290304, while the sum is 43.

The square root of 28746439 is about 5361.5705721365. The cubic root of 28746439 is about 306.3336351335. Note that the first 3 decimals are identical.

The spelling of 28746439 in words is "twenty-eight million, seven hundred forty-six thousand, four hundred thirty-nine".