28433911680 has 512 divisors, whose sum is σ = 109155340800. Its totient is φ = 6967296000.

The previous prime is 28433911661. The next prime is 28433911687. The reversal of 28433911680 is 8611933482.

28433911680 is a `hidden beast` number, since 28 + 433 + 9 + 116 + 80 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28433911687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12630555 + ... + 12632805.

It is an arithmetic number, because the mean of its divisors is an integer number (213194025).

Almost surely, 2^28433911680 is an apocalyptic number.

28433911680 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 28433911680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54577670400).

28433911680 is an abundant number, since it is smaller than the sum of its proper divisors (80721429120).

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

28433911680 is a wasteful number, since it uses less digits than its factorization.

28433911680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339 (or 2321 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 28433911680 in words is "twenty-eight billion, four hundred thirty-three million, nine hundred eleven thousand, six hundred eighty".