28976814640 has 20 divisors (see below), whose sum is σ = 67371094224. Its totient is φ = 11590725824.

The previous prime is 28976814617. The next prime is 28976814641. The reversal of 28976814640 is 4641867982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (28976814641) 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, 181105012 + ... + 181105171.

Almost surely, 2^28976814640 is an apocalyptic number.

28976814640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28976814640 is an abundant number, since it is smaller than the sum of its proper divisors (38394279584).

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

28976814640 is a wasteful number, since it uses less digits than its factorization.

28976814640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362210196 (or 362210190 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 28976814640 in words is "twenty-eight billion, nine hundred seventy-six million, eight hundred fourteen thousand, six hundred forty".