72684893 has 2 divisors, whose sum is σ = 72684894. Its totient is φ = 72684892.

The previous prime is 72684881. The next prime is 72684917. The reversal of 72684893 is 39848627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72369049 + 315844 = 8507^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 72684893 - 2¹⁰ = 72683869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72684193) 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, 36342446 + 36342447.

It is an arithmetic number, because the mean of its divisors is an integer number (36342447).

Almost surely, 2^72684893 is an apocalyptic number.

It is an amenable number.

72684893 is a deficient number, since it is larger than the sum of its proper divisors (1).

72684893 is an equidigital number, since it uses as much as digits as its factorization.

72684893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 47.

The square root of 72684893 is about 8525.5435603837. The cubic root of 72684893 is about 417.3317102938.

The spelling of 72684893 in words is "seventy-two million, six hundred eighty-four thousand, eight hundred ninety-three".