28626641 has 4 divisors (see below), whose sum is σ = 29400372. Its totient is φ = 27852912.

The previous prime is 28626607. The next prime is 28626649. The reversal of 28626641 is 14662682.

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 27196225 + 1430416 = 5215^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 28626641 - 2²² = 24432337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28626649) 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, 386810 + ... + 386883.

It is an arithmetic number, because the mean of its divisors is an integer number (7350093).

Almost surely, 2^28626641 is an apocalyptic number.

It is an amenable number.

28626641 is a deficient number, since it is larger than the sum of its proper divisors (773731).

28626641 is an equidigital number, since it uses as much as digits as its factorization.

28626641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773730.

The product of its digits is 27648, while the sum is 35.

The square root of 28626641 is about 5350.3869953490. The cubic root of 28626641 is about 305.9075040470.

The spelling of 28626641 in words is "twenty-eight million, six hundred twenty-six thousand, six hundred forty-one".