28532645 has 4 divisors (see below), whose sum is σ = 34239180. Its totient is φ = 22826112.

The previous prime is 28532641. The next prime is 28532653. The reversal of 28532645 is 54623582.

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 16924996 + 11607649 = 4114^2 + 3407^2 .

It is a cyclic number.

It is not a de Polignac number, because 28532645 - 2² = 28532641 is a prime.

It is a super-2 number, since 2×28532645² = 1628223661392050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28532641) 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, 2853260 + ... + 2853269.

It is an arithmetic number, because the mean of its divisors is an integer number (8559795).

Almost surely, 2^28532645 is an apocalyptic number.

It is an amenable number.

28532645 is a deficient number, since it is larger than the sum of its proper divisors (5706535).

28532645 is an equidigital number, since it uses as much as digits as its factorization.

28532645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706534.

The product of its digits is 57600, while the sum is 35.

The square root of 28532645 is about 5341.5957353585. The cubic root of 28532645 is about 305.5723196434.

The spelling of 28532645 in words is "twenty-eight million, five hundred thirty-two thousand, six hundred forty-five".