72730353661 has 8 divisors (see below), whose sum is σ = 83136803904. Its totient is φ = 62328003360.

The previous prime is 72730353613. The next prime is 72730353673. The reversal of 72730353661 is 16635303727.

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

It is not a de Polignac number, because 72730353661 - 2²¹ = 72728256509 is a prime.

It is a super-2 number, since 2×72730353661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72730353961) 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, 986875 + ... + 1058008.

It is an arithmetic number, because the mean of its divisors is an integer number (10392100488).

Almost surely, 2^72730353661 is an apocalyptic number.

It is an amenable number.

72730353661 is a deficient number, since it is larger than the sum of its proper divisors (10406450243).

72730353661 is a wasteful number, since it uses less digits than its factorization.

72730353661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049971.

The product of its (nonzero) digits is 476280, while the sum is 43.

The spelling of 72730353661 in words is "seventy-two billion, seven hundred thirty million, three hundred fifty-three thousand, six hundred sixty-one".