72077723789 has 4 divisors (see below), whose sum is σ = 72738987420. Its totient is φ = 71416460160.

The previous prime is 72077723743. The next prime is 72077723797. The reversal of 72077723789 is 98732777027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31944412900 + 40133310889 = 178730^2 + 200333^2 .

It is a cyclic number.

It is not a de Polignac number, because 72077723789 - 2⁸ = 72077723533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72077723089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330631652 + ... + 330631869.

It is an arithmetic number, because the mean of its divisors is an integer number (18184746855).

Almost surely, 2^72077723789 is an apocalyptic number.

It is an amenable number.

72077723789 is a deficient number, since it is larger than the sum of its proper divisors (661263631).

72077723789 is a wasteful number, since it uses less digits than its factorization.

72077723789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661263630.

The product of its (nonzero) digits is 14521248, while the sum is 59.

The spelling of 72077723789 in words is "seventy-two billion, seventy-seven million, seven hundred twenty-three thousand, seven hundred eighty-nine".