28711672920 has 576 divisors, whose sum is σ = 115729024320. Its totient is φ = 6042138624.

The previous prime is 28711672919. The next prime is 28711672931. The reversal of 28711672920 is 2927611782.

It is a happy number.

It is a super-2 number, since 2×28711672920² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 33659214 + ... + 33660066.

It is an arithmetic number, because the mean of its divisors is an integer number (200918445).

Almost surely, 2^28711672920 is an apocalyptic number.

28711672920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28711672920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57864512160).

28711672920 is an abundant number, since it is smaller than the sum of its proper divisors (87017351400).

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

28711672920 is a wasteful number, since it uses less digits than its factorization.

28711672920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 28711672920 in words is "twenty-eight billion, seven hundred eleven million, six hundred seventy-two thousand, nine hundred twenty".