72866839 has 2 divisors, whose sum is σ = 72866840. Its totient is φ = 72866838.

The previous prime is 72866831. The next prime is 72866851. The reversal of 72866839 is 93866827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72866839 - 2³ = 72866831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72866792 and 72866801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72866831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36433419 + 36433420.

It is an arithmetic number, because the mean of its divisors is an integer number (36433420).

Almost surely, 2^72866839 is an apocalyptic number.

72866839 is a deficient number, since it is larger than the sum of its proper divisors (1).

72866839 is an equidigital number, since it uses as much as digits as its factorization.

72866839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 72866839 is about 8536.2075302795. The cubic root of 72866839 is about 417.6796439668.

The spelling of 72866839 in words is "seventy-two million, eight hundred sixty-six thousand, eight hundred thirty-nine".