72547453721 has 8 divisors (see below), whose sum is σ = 74193168000. Its totient is φ = 70919924400.

The previous prime is 72547453687. The next prime is 72547453753. The reversal of 72547453721 is 12735474527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72547453721 - 2¹⁰ = 72547452697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72547453021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4538171 + ... + 4554128.

It is an arithmetic number, because the mean of its divisors is an integer number (9274146000).

Almost surely, 2^72547453721 is an apocalyptic number.

It is an amenable number.

72547453721 is a deficient number, since it is larger than the sum of its proper divisors (1645714279).

72547453721 is a wasteful number, since it uses less digits than its factorization.

72547453721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9092479.

The product of its digits is 1646400, while the sum is 47.

The spelling of 72547453721 in words is "seventy-two billion, five hundred forty-seven million, four hundred fifty-three thousand, seven hundred twenty-one".