28644651607 has 16 divisors (see below), whose sum is σ = 33734806560. Its totient is φ = 23978649600.

The previous prime is 28644651593. The next prime is 28644651649. The reversal of 28644651607 is 70615644682.

It is a cyclic number.

It is not a de Polignac number, because 28644651607 - 2⁷ = 28644651479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28644651677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186394 + ... + 303367.

It is an arithmetic number, because the mean of its divisors is an integer number (2108425410).

Almost surely, 2^28644651607 is an apocalyptic number.

28644651607 is a deficient number, since it is larger than the sum of its proper divisors (5090154953).

28644651607 is a wasteful number, since it uses less digits than its factorization.

28644651607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490194.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 28644651607 in words is "twenty-eight billion, six hundred forty-four million, six hundred fifty-one thousand, six hundred seven".