28782302640 has 320 divisors, whose sum is σ = 110012292096. Its totient is φ = 6061879296.

The previous prime is 28782302639. The next prime is 28782302671. The reversal of 28782302640 is 4620328782.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 28782302592 and 28782302601.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19808154 + ... + 19809606.

Almost surely, 2^28782302640 is an apocalyptic number.

28782302640 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 28782302640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55006146048).

28782302640 is an abundant number, since it is smaller than the sum of its proper divisors (81229989456).

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

28782302640 is a wasteful number, since it uses less digits than its factorization.

28782302640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396 (or 2390 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 28782302640 in words is "twenty-eight billion, seven hundred eighty-two million, three hundred two thousand, six hundred forty".