72781763 has 2 divisors, whose sum is σ = 72781764. Its totient is φ = 72781762.

The previous prime is 72781747. The next prime is 72781771. The reversal of 72781763 is 36718727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72781763 - 2⁴ = 72781747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72781763.

It is not a weakly prime, because it can be changed into another prime (72781733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36390881 + 36390882.

It is an arithmetic number, because the mean of its divisors is an integer number (36390882).

Almost surely, 2^72781763 is an apocalyptic number.

72781763 is a deficient number, since it is larger than the sum of its proper divisors (1).

72781763 is an equidigital number, since it uses as much as digits as its factorization.

72781763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 72781763 is about 8531.2228314586. Note that the first 3 decimals coincide. The cubic root of 72781763 is about 417.5170260904.

The spelling of 72781763 in words is "seventy-two million, seven hundred eighty-one thousand, seven hundred sixty-three".