28077473820 has 192 divisors, whose sum is σ = 92200550400. Its totient is φ = 6311082240.

The previous prime is 28077473797. The next prime is 28077473857. The reversal of 28077473820 is 2837477082.

It is a super-2 number, since 2×28077473820² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28077473820.

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, 565561 + ... + 613199.

It is an arithmetic number, because the mean of its divisors is an integer number (480211200).

Almost surely, 2^28077473820 is an apocalyptic number.

28077473820 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 28077473820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46100275200).

28077473820 is an abundant number, since it is smaller than the sum of its proper divisors (64123076580).

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

28077473820 is a wasteful number, since it uses less digits than its factorization.

28077473820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47728 (or 47726 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 48.

The spelling of 28077473820 in words is "twenty-eight billion, seventy-seven million, four hundred seventy-three thousand, eight hundred twenty".