28646545 has 8 divisors (see below), whose sum is σ = 34499880. Its totient is φ = 22834560.

The previous prime is 28646543. The next prime is 28646561. The reversal of 28646545 is 54564682.

It can be written as a sum of positive squares in 4 ways, for example, as 11861136 + 16785409 = 3444^2 + 4097^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28646545 - 2¹ = 28646543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28646498 and 28646507.

It is not an unprimeable number, because it can be changed into a prime (28646543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8790 + ... + 11599.

It is an arithmetic number, because the mean of its divisors is an integer number (4312485).

Almost surely, 2^28646545 is an apocalyptic number.

It is an amenable number.

28646545 is a deficient number, since it is larger than the sum of its proper divisors (5853335).

28646545 is a wasteful number, since it uses less digits than its factorization.

28646545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20675.

The product of its digits is 230400, while the sum is 40.

The square root of 28646545 is about 5352.2467245074. The cubic root of 28646545 is about 305.9783864154.

It can be divided in two parts, 2864 and 6545, that added together give a square (9409 = 97²).

The spelling of 28646545 in words is "twenty-eight million, six hundred forty-six thousand, five hundred forty-five".