28208444644 has 24 divisors (see below), whose sum is σ = 49561146936. Its totient is φ = 14048160000.

The previous prime is 28208444611. The next prime is 28208444651. The reversal of 28208444644 is 44644480282.

It can be written as a sum of positive squares in 4 ways, for example, as 4291822144 + 23916622500 = 65512^2 + 154650^2 .

It is a super-2 number, since 2×28208444644² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28208444594 and 28208444603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4156534 + ... + 4163314.

It is an arithmetic number, because the mean of its divisors is an integer number (2065047789).

Almost surely, 2^28208444644 is an apocalyptic number.

It is an amenable number.

28208444644 is a deficient number, since it is larger than the sum of its proper divisors (21352702292).

28208444644 is a wasteful number, since it uses less digits than its factorization.

28208444644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10767 (or 10765 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 46.

The spelling of 28208444644 in words is "twenty-eight billion, two hundred eight million, four hundred forty-four thousand, six hundred forty-four".