651505280 has 128 divisors (see below), whose sum is σ = 1662644880. Its totient is φ = 243269632.

The previous prime is 651505277. The next prime is 651505303. The reversal of 651505280 is 82505156.

It can be written as a sum of positive squares in 8 ways, for example, as 480837184 + 170668096 = 21928^2 + 13064^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2534912 + ... + 2535168.

Almost surely, 2^651505280 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 651505280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831322440).

651505280 is an abundant number, since it is smaller than the sum of its proper divisors (1011139600).

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

651505280 is a wasteful number, since it uses less digits than its factorization.

651505280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 651505280 is about 25524.6014660366. The cubic root of 651505280 is about 866.9072731039.

The spelling of 651505280 in words is "six hundred fifty-one million, five hundred five thousand, two hundred eighty".