28071685664 has 24 divisors (see below), whose sum is σ = 60290325648. Its totient is φ = 12759856960.

The previous prime is 28071685639. The next prime is 28071685673. The reversal of 28071685664 is 46658617082.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39874202 + ... + 39874905.

It is an arithmetic number, because the mean of its divisors is an integer number (2512096902).

Almost surely, 2^28071685664 is an apocalyptic number.

It is an amenable number.

28071685664 is an abundant number, since it is smaller than the sum of its proper divisors (32218639984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28071685664 is a wasteful number, since it uses less digits than its factorization.

28071685664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79749128 (or 79749120 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 28071685664 in words is "twenty-eight billion, seventy-one million, six hundred eighty-five thousand, six hundred sixty-four".