72780047 has 2 divisors, whose sum is σ = 72780048. Its totient is φ = 72780046.

The previous prime is 72779969. The next prime is 72780079. The reversal of 72780047 is 74008727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72780047 - 2¹⁶ = 72714511 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72779989 and 72780016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72785047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36390023 + 36390024.

It is an arithmetic number, because the mean of its divisors is an integer number (36390024).

Almost surely, 2^72780047 is an apocalyptic number.

72780047 is a deficient number, since it is larger than the sum of its proper divisors (1).

72780047 is an equidigital number, since it uses as much as digits as its factorization.

72780047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 72780047 is about 8531.1222591169. The cubic root of 72780047 is about 417.5137447517.

The spelling of 72780047 in words is "seventy-two million, seven hundred eighty thousand, forty-seven".