7285721580 has 60 divisors (see below), whose sum is σ = 22855583520. Its totient is φ = 1942858656.

The previous prime is 7285721567. The next prime is 7285721581. The reversal of 7285721580 is 851275827.

7285721580 is a `hidden beast` number, since 7 + 28 + 572 + 1 + 58 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7285721581) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2247060 + ... + 2250299.

It is an arithmetic number, because the mean of its divisors is an integer number (380926392).

Almost surely, 2^7285721580 is an apocalyptic number.

It is an amenable number.

7285721580 is an abundant number, since it is smaller than the sum of its proper divisors (15569861940).

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

7285721580 is a wasteful number, since it uses less digits than its factorization.

7285721580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4497380 (or 4497369 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 45.

The square root of 7285721580 is about 85356.4384214805. The cubic root of 7285721580 is about 1938.6118226630.

The spelling of 7285721580 in words is "seven billion, two hundred eighty-five million, seven hundred twenty-one thousand, five hundred eighty".