72772772781 has 16 divisors (see below), whose sum is σ = 98605890560. Its totient is φ = 47731759920.

The previous prime is 72772772773. The next prime is 72772772791. The reversal of 72772772781 is 18727727727.

It is not a de Polignac number, because 72772772781 - 2³ = 72772772773 is a prime.

It is a super-2 number, since 2×72772772781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72772772711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475435 + ... + 609576.

It is an arithmetic number, because the mean of its divisors is an integer number (6162868160).

Almost surely, 2^72772772781 is an apocalyptic number.

It is an amenable number.

72772772781 is a deficient number, since it is larger than the sum of its proper divisors (25833117779).

72772772781 is a wasteful number, since it uses less digits than its factorization.

72772772781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085376.

The product of its digits is 7529536, while the sum is 57.

The spelling of 72772772781 in words is "seventy-two billion, seven hundred seventy-two million, seven hundred seventy-two thousand, seven hundred eighty-one".