28640685448 has 8 divisors (see below), whose sum is σ = 53701285230. Its totient is φ = 14320342720.

The previous prime is 28640685433. The next prime is 28640685457. The reversal of 28640685448 is 84458604682.

It can be written as a sum of positive squares in only one way, i.e., 22940737444 + 5699948004 = 151462^2 + 75498^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1790042833 + ... + 1790042848.

Almost surely, 2^28640685448 is an apocalyptic number.

It is an amenable number.

28640685448 is a deficient number, since it is larger than the sum of its proper divisors (25060599782).

28640685448 is a wasteful number, since it uses less digits than its factorization.

28640685448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580085687 (or 3580085683 counting only the distinct ones).

The product of its (nonzero) digits is 11796480, while the sum is 55.

The spelling of 28640685448 in words is "twenty-eight billion, six hundred forty million, six hundred eighty-five thousand, four hundred forty-eight".