72779697727 has 8 divisors (see below), whose sum is σ = 79725480912. Its totient is φ = 65888822400.

The previous prime is 72779697689. The next prime is 72779697743.

72779697727 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72779697727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72779697127) 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, 13724188 + ... + 13729489.

It is an arithmetic number, because the mean of its divisors is an integer number (9965685114).

Almost surely, 2^72779697727 is an apocalyptic number.

72779697727 is a deficient number, since it is larger than the sum of its proper divisors (6945783185).

72779697727 is a wasteful number, since it uses less digits than its factorization.

72779697727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27453929.

The product of its digits is 228709656, while the sum is 70.

The spelling of 72779697727 in words is "seventy-two billion, seven hundred seventy-nine million, six hundred ninety-seven thousand, seven hundred twenty-seven".