72821867 has 2 divisors, whose sum is σ = 72821868. Its totient is φ = 72821866.

The previous prime is 72821857. The next prime is 72821873. The reversal of 72821867 is 76812827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72821867 - 2⁶ = 72821803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72821857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36410933 + 36410934.

It is an arithmetic number, because the mean of its divisors is an integer number (36410934).

Almost surely, 2^72821867 is an apocalyptic number.

72821867 is a deficient number, since it is larger than the sum of its proper divisors (1).

72821867 is an equidigital number, since it uses as much as digits as its factorization.

72821867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 41.

The square root of 72821867 is about 8533.5729328342. The cubic root of 72821867 is about 417.5936983575.

The spelling of 72821867 in words is "seventy-two million, eight hundred twenty-one thousand, eight hundred sixty-seven".