7280661872 has 40 divisors (see below), whose sum is σ = 15393471600. Its totient is φ = 3308359680.

The previous prime is 7280661833. The next prime is 7280661907. The reversal of 7280661872 is 2781660827.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044254 + ... + 1051202.

It is an arithmetic number, because the mean of its divisors is an integer number (384836790).

Almost surely, 2^7280661872 is an apocalyptic number.

It is an amenable number.

7280661872 is an abundant number, since it is smaller than the sum of its proper divisors (8112809728).

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

7280661872 is a wasteful number, since it uses less digits than its factorization.

7280661872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12921 (or 12915 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 7280661872 is about 85326.7945723968. The cubic root of 7280661872 is about 1938.1629501135.

The spelling of 7280661872 in words is "seven billion, two hundred eighty million, six hundred sixty-one thousand, eight hundred seventy-two".