28391989248 has 504 divisors, whose sum is σ = 99060792480. Its totient is φ = 7803371520.

The previous prime is 28391989231. The next prime is 28391989253. The reversal of 28391989248 is 84298919382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (504).

It is a super-2 number, since 2×28391989248² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 104767353 + ... + 104767623.

Almost surely, 2^28391989248 is an apocalyptic number.

28391989248 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 28391989248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49530396240).

28391989248 is an abundant number, since it is smaller than the sum of its proper divisors (70668803232).

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

28391989248 is a wasteful number, since it uses less digits than its factorization.

28391989248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 312 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 63.

The spelling of 28391989248 in words is "twenty-eight billion, three hundred ninety-one million, nine hundred eighty-nine thousand, two hundred forty-eight".