72381877 has 2 divisors, whose sum is σ = 72381878. Its totient is φ = 72381876.

The previous prime is 72381863. The next prime is 72381913. The reversal of 72381877 is 77818327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45279441 + 27102436 = 6729^2 + 5206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72381877 is a prime.

It is a super-2 number, since 2×72381877² = 10478272236086258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72381817) 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, 36190938 + 36190939.

It is an arithmetic number, because the mean of its divisors is an integer number (36190939).

Almost surely, 2^72381877 is an apocalyptic number.

It is an amenable number.

72381877 is a deficient number, since it is larger than the sum of its proper divisors (1).

72381877 is an equidigital number, since it uses as much as digits as its factorization.

72381877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 43.

The square root of 72381877 is about 8507.7539339123. The cubic root of 72381877 is about 416.7509645619.

The spelling of 72381877 in words is "seventy-two million, three hundred eighty-one thousand, eight hundred seventy-seven".