28628660280 has 256 divisors, whose sum is σ = 103520332800. Its totient is φ = 6247915520.

The previous prime is 28628660273. The next prime is 28628660293. The reversal of 28628660280 is 8206682682.

It is a congruent number.

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, 488386 + ... + 543854.

It is an arithmetic number, because the mean of its divisors is an integer number (404376300).

Almost surely, 2^28628660280 is an apocalyptic number.

28628660280 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 28628660280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51760166400).

28628660280 is an abundant number, since it is smaller than the sum of its proper divisors (74891672520).

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

28628660280 is a wasteful number, since it uses less digits than its factorization.

28628660280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55534 (or 55530 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 28628660280 in words is "twenty-eight billion, six hundred twenty-eight million, six hundred sixty thousand, two hundred eighty".