72871811 has 2 divisors, whose sum is σ = 72871812. Its totient is φ = 72871810.

The previous prime is 72871787. The next prime is 72871819. The reversal of 72871811 is 11817827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72871811 - 2¹⁴ = 72855427 is a prime.

It is not a weakly prime, because it can be changed into another prime (72871819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36435905 + 36435906.

It is an arithmetic number, because the mean of its divisors is an integer number (36435906).

Almost surely, 2^72871811 is an apocalyptic number.

72871811 is a deficient number, since it is larger than the sum of its proper divisors (1).

72871811 is an equidigital number, since it uses as much as digits as its factorization.

72871811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 35.

The square root of 72871811 is about 8536.4987553446. The cubic root of 72871811 is about 417.6891437429.

The spelling of 72871811 in words is "seventy-two million, eight hundred seventy-one thousand, eight hundred eleven".