28809231960 has 32 divisors (see below), whose sum is σ = 86427696240. Its totient is φ = 7682461824.

The previous prime is 28809231947. The next prime is 28809231961. The reversal of 28809231960 is 6913290882.

It is a super-2 number, since 2×28809231960² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28809231961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120038347 + ... + 120038586.

Almost surely, 2^28809231960 is an apocalyptic number.

28809231960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28809231960 is an abundant number, since it is smaller than the sum of its proper divisors (57618464280).

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

28809231960 is a wasteful number, since it uses less digits than its factorization.

28809231960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240076947 (or 240076943 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 28809231960 in words is "twenty-eight billion, eight hundred nine million, two hundred thirty-one thousand, nine hundred sixty".