7281081825 has 24 divisors (see below), whose sum is σ = 12561451968. Its totient is φ = 3714406080.

The previous prime is 7281081811. The next prime is 7281081833. The reversal of 7281081825 is 5281801827.

It is not a de Polignac number, because 7281081825 - 2⁶ = 7281081761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2108734 + ... + 2112183.

It is an arithmetic number, because the mean of its divisors is an integer number (523393832).

Almost surely, 2^7281081825 is an apocalyptic number.

7281081825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7281081825 is a deficient number, since it is larger than the sum of its proper divisors (5280370143).

7281081825 is a wasteful number, since it uses less digits than its factorization.

7281081825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220953 (or 4220948 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 42.

The square root of 7281081825 is about 85329.2553875867. The cubic root of 7281081825 is about 1938.2002142025.

The spelling of 7281081825 in words is "seven billion, two hundred eighty-one million, eighty-one thousand, eight hundred twenty-five".