72855361 has 2 divisors, whose sum is σ = 72855362. Its totient is φ = 72855360.

The previous prime is 72855359. The next prime is 72855371. The reversal of 72855361 is 16355827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36675136 + 36180225 = 6056^2 + 6015^2 .

It is a cyclic number.

It is not a de Polignac number, because 72855361 - 2¹ = 72855359 is a prime.

Together with 72855359, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72855361.

It is not a weakly prime, because it can be changed into another prime (72855371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36427680 + 36427681.

It is an arithmetic number, because the mean of its divisors is an integer number (36427681).

Almost surely, 2^72855361 is an apocalyptic number.

It is an amenable number.

72855361 is a deficient number, since it is larger than the sum of its proper divisors (1).

72855361 is an equidigital number, since it uses as much as digits as its factorization.

72855361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 72855361 is about 8535.5351911875. The cubic root of 72855361 is about 417.6577118197.

The spelling of 72855361 in words is "seventy-two million, eight hundred fifty-five thousand, three hundred sixty-one".