72720727776 has 48 divisors (see below), whose sum is σ = 212102125200. Its totient is φ = 24240242304.

The previous prime is 72720727757. The next prime is 72720727823. The reversal of 72720727776 is 67772702727.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 42082891 + ... + 42084618.

It is an arithmetic number, because the mean of its divisors is an integer number (4418794275).

Almost surely, 2^72720727776 is an apocalyptic number.

It is an amenable number.

72720727776 is an abundant number, since it is smaller than the sum of its proper divisors (139381397424).

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

72720727776 is a wasteful number, since it uses less digits than its factorization.

72720727776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84167528 (or 84167514 counting only the distinct ones).

The product of its (nonzero) digits is 5647152, while the sum is 54.

The spelling of 72720727776 in words is "seventy-two billion, seven hundred twenty million, seven hundred twenty-seven thousand, seven hundred seventy-six".