28971587712 has 32 divisors (see below), whose sum is σ = 76955780880. Its totient is φ = 9657195776.

The previous prime is 28971587707. The next prime is 28971587797. The reversal of 28971587712 is 21778517982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

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, 37723038 + ... + 37723805.

Almost surely, 2^28971587712 is an apocalyptic number.

It is an amenable number.

28971587712 is an abundant number, since it is smaller than the sum of its proper divisors (47984193168).

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

28971587712 is an equidigital number, since it uses as much as digits as its factorization.

28971587712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75446860 (or 75446848 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 57.

The spelling of 28971587712 in words is "twenty-eight billion, nine hundred seventy-one million, five hundred eighty-seven thousand, seven hundred twelve".