28702943 has 4 divisors (see below), whose sum is σ = 29096208. Its totient is φ = 28309680.

The previous prime is 28702937. The next prime is 28702967. The reversal of 28702943 is 34920782.

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-28702943 is a prime.

It is a super-2 number, since 2×28702943² = 1647717873722498, 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 (28702903) 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, 196523 + ... + 196668.

It is an arithmetic number, because the mean of its divisors is an integer number (7274052).

Almost surely, 2^28702943 is an apocalyptic number.

28702943 is a deficient number, since it is larger than the sum of its proper divisors (393265).

28702943 is an equidigital number, since it uses as much as digits as its factorization.

28702943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393264.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28702943 is about 5357.5127624673. The cubic root of 28702943 is about 306.1790535087.

The spelling of 28702943 in words is "twenty-eight million, seven hundred two thousand, nine hundred forty-three".