28453657 has 4 divisors (see below), whose sum is σ = 28486836. Its totient is φ = 28420480.

The previous prime is 28453637. The next prime is 28453673. The reversal of 28453657 is 75635482.

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 17799961 + 10653696 = 4219^2 + 3264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28453657 is a prime.

It is a super-2 number, since 2×28453657² = 1619221193347298, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28453637) 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, 15268 + ... + 17029.

It is an arithmetic number, because the mean of its divisors is an integer number (7121709).

Almost surely, 2^28453657 is an apocalyptic number.

It is an amenable number.

28453657 is a deficient number, since it is larger than the sum of its proper divisors (33179).

28453657 is an equidigital number, since it uses as much as digits as its factorization.

28453657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33178.

The product of its digits is 201600, while the sum is 40.

The square root of 28453657 is about 5334.1969404963. The cubic root of 28453657 is about 305.2900832389.

The spelling of 28453657 in words is "twenty-eight million, four hundred fifty-three thousand, six hundred fifty-seven".