28128881630 has 8 divisors (see below), whose sum is σ = 50631986952. Its totient is φ = 11251552648.

The previous prime is 28128881609. The next prime is 28128881653. The reversal of 28128881630 is 3618882182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent 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, 1406444072 + ... + 1406444091.

It is an arithmetic number, because the mean of its divisors is an integer number (6328998369).

Almost surely, 2^28128881630 is an apocalyptic number.

28128881630 is a deficient number, since it is larger than the sum of its proper divisors (22503105322).

28128881630 is a wasteful number, since it uses less digits than its factorization.

28128881630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812888170.

The product of its (nonzero) digits is 294912, while the sum is 47.

The spelling of 28128881630 in words is "twenty-eight billion, one hundred twenty-eight million, eight hundred eighty-one thousand, six hundred thirty".