28000002669644 has 24 divisors (see below), whose sum is σ = 51768163419840. Its totient is φ = 13229641757696.

The previous prime is 28000002669643. The next prime is 28000002669647. The reversal of 28000002669644 is 44696620000082.

It is a happy number.

It is a super-2 number, since 2×28000002669644² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (28000002669643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2567859797 + ... + 2567870700.

It is an arithmetic number, because the mean of its divisors is an integer number (2157006809160).

Almost surely, 2^{28000002669644} is an apocalyptic number.

It is an amenable number.

28000002669644 is a deficient number, since it is larger than the sum of its proper divisors (23768160750196).

28000002669644 is a wasteful number, since it uses less digits than its factorization.

28000002669644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5135730577 (or 5135730575 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 47.

The spelling of 28000002669644 in words is "twenty-eight trillion, two million, six hundred sixty-nine thousand, six hundred forty-four".