28003397760 has 768 divisors, whose sum is σ = 113834448000. Its totient is φ = 6530347008.

The previous prime is 28003397729. The next prime is 28003397761. The reversal of 28003397760 is 6779330082.

It is a happy number.

It is a super-2 number, since 2×28003397760² (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 not an unprimeable number, because it can be changed into a prime (28003397761) 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, 1473863031 + ... + 1473863049.

Almost surely, 2^28003397760 is an apocalyptic number.

28003397760 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 28003397760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56917224000).

28003397760 is an abundant number, since it is smaller than the sum of its proper divisors (85831050240).

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

28003397760 is an frugal number, since it uses more digits than its factorization.

28003397760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The spelling of 28003397760 in words is "twenty-eight billion, three million, three hundred ninety-seven thousand, seven hundred sixty".