28478536664 has 16 divisors (see below), whose sum is σ = 54533368800. Its totient is φ = 13936304992.

The previous prime is 28478536661. The next prime is 28478536741. The reversal of 28478536664 is 46663587482.

It is a super-2 number, since 2×28478536664² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478536661) 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, 37870019 + ... + 37870770.

It is an arithmetic number, because the mean of its divisors is an integer number (3408335550).

Almost surely, 2^28478536664 is an apocalyptic number.

It is an amenable number.

28478536664 is a deficient number, since it is larger than the sum of its proper divisors (26054832136).

28478536664 is a wasteful number, since it uses less digits than its factorization.

28478536664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75740842 (or 75740838 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 59.

The spelling of 28478536664 in words is "twenty-eight billion, four hundred seventy-eight million, five hundred thirty-six thousand, six hundred sixty-four".