72779105881 has 8 divisors (see below), whose sum is σ = 74199582144. Its totient is φ = 71360381040.

The previous prime is 72779105879. The next prime is 72779105887. The reversal of 72779105881 is 18850197727.

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 72779105881 - 2¹ = 72779105879 is a prime.

It is a super-2 number, since 2×72779105881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72779105887) 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, 353781 + ... + 520306.

It is an arithmetic number, because the mean of its divisors is an integer number (9274947768).

Almost surely, 2^72779105881 is an apocalyptic number.

It is an amenable number.

72779105881 is a deficient number, since it is larger than the sum of its proper divisors (1420476263).

72779105881 is a wasteful number, since it uses less digits than its factorization.

72779105881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875711.

The product of its (nonzero) digits is 1975680, while the sum is 55.

The spelling of 72779105881 in words is "seventy-two billion, seven hundred seventy-nine million, one hundred five thousand, eight hundred eighty-one".