7271665920 has 144 divisors (see below), whose sum is σ = 25804437120. Its totient is φ = 1939101696.

The previous prime is 7271665913. The next prime is 7271665943. The reversal of 7271665920 is 295661727.

It is a tau number, because it is divible by the number of its divisors (144).

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

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, 70644 + ... + 139763.

It is an arithmetic number, because the mean of its divisors is an integer number (179197480).

Almost surely, 2^7271665920 is an apocalyptic number.

It is an amenable number.

7271665920 is an abundant number, since it is smaller than the sum of its proper divisors (18532771200).

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

7271665920 is a wasteful number, since it uses less digits than its factorization.

7271665920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210437 (or 210417 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 7271665920 is about 85274.0635832490. The cubic root of 7271665920 is about 1937.3643593978.

The spelling of 7271665920 in words is "seven billion, two hundred seventy-one million, six hundred sixty-five thousand, nine hundred twenty".