72868729 has 2 divisors, whose sum is σ = 72868730. Its totient is φ = 72868728.

The previous prime is 72868727. The next prime is 72868751. The reversal of 72868729 is 92786827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 5053504 = 8235^2 + 2248^2 .

It is a cyclic number.

It is not a de Polignac number, because 72868729 - 2¹ = 72868727 is a prime.

Together with 72868727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72868721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36434364 + 36434365.

It is an arithmetic number, because the mean of its divisors is an integer number (36434365).

Almost surely, 2^72868729 is an apocalyptic number.

It is an amenable number.

72868729 is a deficient number, since it is larger than the sum of its proper divisors (1).

72868729 is an equidigital number, since it uses as much as digits as its factorization.

72868729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The square root of 72868729 is about 8536.3182344615. The cubic root of 72868729 is about 417.6832551555.

The spelling of 72868729 in words is "seventy-two million, eight hundred sixty-eight thousand, seven hundred twenty-nine".