72771811 has 6 divisors (see below), whose sum is σ = 84652980. Its totient is φ = 62375796.

The previous prime is 72771773. The next prime is 72771821. The reversal of 72771811 is 11817727.

It is not a de Polignac number, because 72771811 - 2⁷ = 72771683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72771821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 742521 + ... + 742618.

It is an arithmetic number, because the mean of its divisors is an integer number (14108830).

Almost surely, 2^72771811 is an apocalyptic number.

72771811 is a deficient number, since it is larger than the sum of its proper divisors (11881169).

72771811 is a wasteful number, since it uses less digits than its factorization.

72771811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485153 (or 1485146 counting only the distinct ones).

The product of its digits is 5488, while the sum is 34.

The square root of 72771811 is about 8530.6395422618. The cubic root of 72771811 is about 417.4979951378.

The spelling of 72771811 in words is "seventy-two million, seven hundred seventy-one thousand, eight hundred eleven".