28772554644 has 240 divisors, whose sum is σ = 80459850240. Its totient is φ = 8949553920.

The previous prime is 28772554637. The next prime is 28772554649. The reversal of 28772554644 is 44645527782.

28772554644 is a `hidden beast` number, since 2 + 8 + 77 + 25 + 546 + 4 + 4 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772554649) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 51656014 + ... + 51656570.

It is an arithmetic number, because the mean of its divisors is an integer number (335249376).

Almost surely, 2^28772554644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28772554644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40229925120).

28772554644 is an abundant number, since it is smaller than the sum of its proper divisors (51687295596).

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

28772554644 is a wasteful number, since it uses less digits than its factorization.

28772554644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 769 counting only the distinct ones).

The product of its digits is 15052800, while the sum is 54.

The spelling of 28772554644 in words is "twenty-eight billion, seven hundred seventy-two million, five hundred fifty-four thousand, six hundred forty-four".