72764420874721 has 4 divisors (see below), whose sum is σ = 72980339037892. Its totient is φ = 72548502711552.

The previous prime is 72764420874679. The next prime is 72764420874763. The reversal of 72764420874721 is 12747802446727.

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

It is an interprime number because it is at equal distance from previous prime (72764420874679) and next prime (72764420874763).

It can be written as a sum of positive squares in 2 ways, for example, as 31142426691600 + 41621994183121 = 5580540^2 + 6451511^2 .

It is a cyclic number.

It is not a de Polignac number, because 72764420874721 - 2³⁵ = 72730061136353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72764420874721.

It is not an unprimeable number, because it can be changed into a prime (72764420874421) 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, 107959081080 + ... + 107959081753.

It is an arithmetic number, because the mean of its divisors is an integer number (18245084759473).

Almost surely, 2^{72764420874721} is an apocalyptic number.

It is an amenable number.

72764420874721 is a deficient number, since it is larger than the sum of its proper divisors (215918163171).

72764420874721 is a wasteful number, since it uses less digits than its factorization.

72764420874721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215918163170.

The product of its (nonzero) digits is 59006976, while the sum is 61.

The spelling of 72764420874721 in words is "seventy-two trillion, seven hundred sixty-four billion, four hundred twenty million, eight hundred seventy-four thousand, seven hundred twenty-one".