28052957 has 4 divisors (see below), whose sum is σ = 28128540. Its totient is φ = 27977376.

The previous prime is 28052933. The next prime is 28052963. The reversal of 28052957 is 75925082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21631801 + 6421156 = 4651^2 + 2534^2 .

It is a cyclic number.

It is not a de Polignac number, because 28052957 - 2¹⁸ = 27790813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28052957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28055957) 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, 37232 + ... + 37977.

It is an arithmetic number, because the mean of its divisors is an integer number (7032135).

Almost surely, 2^28052957 is an apocalyptic number.

It is an amenable number.

28052957 is a deficient number, since it is larger than the sum of its proper divisors (75583).

28052957 is an equidigital number, since it uses as much as digits as its factorization.

28052957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75582.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 28052957 is about 5296.5042244862. The cubic root of 28052957 is about 303.8502154832.

The spelling of 28052957 in words is "twenty-eight million, fifty-two thousand, nine hundred fifty-seven".