28068387840 has 352 divisors, whose sum is σ = 100246666560. Its totient is φ = 7447707648.

The previous prime is 28068387821. The next prime is 28068387859. The reversal of 28068387840 is 4878386082.

It is an interprime number because it is at equal distance from previous prime (28068387821) and next prime (28068387859).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38292114 + ... + 38292846.

Almost surely, 2^28068387840 is an apocalyptic number.

28068387840 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 28068387840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50123333280).

28068387840 is an abundant number, since it is smaller than the sum of its proper divisors (72178278720).

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

28068387840 is a wasteful number, since it uses less digits than its factorization.

28068387840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 28068387840 in words is "twenty-eight billion, sixty-eight million, three hundred eighty-seven thousand, eight hundred forty".