72743777 has 4 divisors (see below), whose sum is σ = 72760836. Its totient is φ = 72726720.

The previous prime is 72743771. The next prime is 72743789. The reversal of 72743777 is 77734727.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 51251281 + 21492496 = 7159^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 72743777 - 2⁸ = 72743521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72743771) 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, 4253 + ... + 12789.

It is an arithmetic number, because the mean of its divisors is an integer number (18190209).

Almost surely, 2^72743777 is an apocalyptic number.

It is an amenable number.

72743777 is a deficient number, since it is larger than the sum of its proper divisors (17059).

72743777 is an equidigital number, since it uses as much as digits as its factorization.

72743777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17058.

The product of its digits is 403368, while the sum is 44.

The square root of 72743777 is about 8528.9962480939. The cubic root of 72743777 is about 417.4443771141. Note that the first 3 decimals are identical.

The spelling of 72743777 in words is "seventy-two million, seven hundred forty-three thousand, seven hundred seventy-seven".