72272777 has 4 divisors (see below), whose sum is σ = 72935940. Its totient is φ = 71609616.

The previous prime is 72272773. The next prime is 72272801. The reversal of 72272777 is 77727227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50965321 + 21307456 = 7139^2 + 4616^2 .

It is a cyclic number.

It is not a de Polignac number, because 72272777 - 2² = 72272773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72272771) 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 3 ways as a sum of consecutive naturals, for example, 331418 + ... + 331635.

It is an arithmetic number, because the mean of its divisors is an integer number (18233985).

Almost surely, 2^72272777 is an apocalyptic number.

It is an amenable number.

72272777 is a deficient number, since it is larger than the sum of its proper divisors (663163).

72272777 is a wasteful number, since it uses less digits than its factorization.

72272777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663162.

The product of its digits is 134456, while the sum is 41.

The square root of 72272777 is about 8501.3397179503. The cubic root of 72272777 is about 416.5414720047.

The spelling of 72272777 in words is "seventy-two million, two hundred seventy-two thousand, seven hundred seventy-seven".