28383351920 has 480 divisors, whose sum is σ = 86764732416. Its totient is φ = 8534937600.

The previous prime is 28383351881. The next prime is 28383351923. The reversal of 28383351920 is 2915338382.

It is a super-2 number, since 2×28383351920² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28383351923) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 223490897 + ... + 223491023.

Almost surely, 2^28383351920 is an apocalyptic number.

28383351920 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 28383351920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43382366208).

28383351920 is an abundant number, since it is smaller than the sum of its proper divisors (58381380496).

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

28383351920 is a wasteful number, since it uses less digits than its factorization.

28383351920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 28383351920 in words is "twenty-eight billion, three hundred eighty-three million, three hundred fifty-one thousand, nine hundred twenty".