72730521077 has 8 divisors (see below), whose sum is σ = 72915693312. Its totient is φ = 72545468400.

The previous prime is 72730521067. The next prime is 72730521079. The reversal of 72730521077 is 77012503727.

It is a happy number.

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 72730521077 - 2⁶ = 72730521013 is a prime.

It is a super-2 number, since 2×72730521077² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72730521079) 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, 1258388 + ... + 1314914.

It is an arithmetic number, because the mean of its divisors is an integer number (9114461664).

Almost surely, 2^72730521077 is an apocalyptic number.

It is an amenable number.

72730521077 is a deficient number, since it is larger than the sum of its proper divisors (185172235).

72730521077 is a wasteful number, since it uses less digits than its factorization.

72730521077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59779.

The product of its (nonzero) digits is 144060, while the sum is 41.

The spelling of 72730521077 in words is "seventy-two billion, seven hundred thirty million, five hundred twenty-one thousand, seventy-seven".