28531263488 has 192 divisors, whose sum is σ = 72648576000. Its totient is φ = 10895818752.

The previous prime is 28531263443. The next prime is 28531263539. The reversal of 28531263488 is 88436213582.

It is a super-2 number, since 2×28531263488² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5402033 + ... + 5407311.

It is an arithmetic number, because the mean of its divisors is an integer number (378378000).

Almost surely, 2^28531263488 is an apocalyptic number.

28531263488 is a gapful number since it is divisible by the number (28) 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 28531263488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36324288000).

28531263488 is an abundant number, since it is smaller than the sum of its proper divisors (44117312512).

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

28531263488 is a wasteful number, since it uses less digits than its factorization.

28531263488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350 (or 5330 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 50.

The spelling of 28531263488 in words is "twenty-eight billion, five hundred thirty-one million, two hundred sixty-three thousand, four hundred eighty-eight".