28465666320 has 640 divisors, whose sum is σ = 117736464384. Its totient is φ = 5518098432.

The previous prime is 28465666319. The next prime is 28465666343. The reversal of 28465666320 is 2366656482.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28465666320.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 15964149 + ... + 15965931.

Almost surely, 2^28465666320 is an apocalyptic number.

28465666320 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 28465666320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58868232192).

28465666320 is an abundant number, since it is smaller than the sum of its proper divisors (89270798064).

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

28465666320 is a wasteful number, since it uses less digits than its factorization.

28465666320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879 (or 1873 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 28465666320 in words is "twenty-eight billion, four hundred sixty-five million, six hundred sixty-six thousand, three hundred twenty".