72287977 has 2 divisors, whose sum is σ = 72287978. Its totient is φ = 72287976.

The previous prime is 72287953. The next prime is 72287983. The reversal of 72287977 is 77978227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45414121 + 26873856 = 6739^2 + 5184^2 .

It is a cyclic number.

It is not a de Polignac number, because 72287977 - 2⁷ = 72287849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72287977.

It is not a weakly prime, because it can be changed into another prime (72287987) 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 as a sum of consecutive naturals, namely, 36143988 + 36143989.

It is an arithmetic number, because the mean of its divisors is an integer number (36143989).

Almost surely, 2^72287977 is an apocalyptic number.

It is an amenable number.

72287977 is a deficient number, since it is larger than the sum of its proper divisors (1).

72287977 is an equidigital number, since it uses as much as digits as its factorization.

72287977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691488, while the sum is 49.

The square root of 72287977 is about 8502.2336476952. The cubic root of 72287977 is about 416.5706715033.

The spelling of 72287977 in words is "seventy-two million, two hundred eighty-seven thousand, nine hundred seventy-seven".