72457305805 has 8 divisors (see below), whose sum is σ = 86950592352. Its totient is φ = 57964627728.

The previous prime is 72457305727. The next prime is 72457305827. The reversal of 72457305805 is 50850375427.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72457305805 is a prime.

It is a super-2 number, since 2×72457305805² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173062 + ... + 418168.

It is an arithmetic number, because the mean of its divisors is an integer number (10868824044).

Almost surely, 2^72457305805 is an apocalyptic number.

It is an amenable number.

72457305805 is a deficient number, since it is larger than the sum of its proper divisors (14493286547).

72457305805 is a wasteful number, since it uses less digits than its factorization.

72457305805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304235.

The product of its (nonzero) digits is 1176000, while the sum is 46.

The spelling of 72457305805 in words is "seventy-two billion, four hundred fifty-seven million, three hundred five thousand, eight hundred five".