72437779 has 2 divisors, whose sum is σ = 72437780. Its totient is φ = 72437778.

The previous prime is 72437713. The next prime is 72437789. The reversal of 72437779 is 97773427.

It is a strong prime.

It is an emirp because it is prime and its reverse (97773427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72437779 - 2²⁵ = 38883347 is a prime.

It is not a weakly prime, because it can be changed into another prime (72437789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36218889 + 36218890.

It is an arithmetic number, because the mean of its divisors is an integer number (36218890).

Almost surely, 2^72437779 is an apocalyptic number.

72437779 is a deficient number, since it is larger than the sum of its proper divisors (1).

72437779 is an equidigital number, since it uses as much as digits as its factorization.

72437779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518616, while the sum is 46.

The square root of 72437779 is about 8511.0386557693. The cubic root of 72437779 is about 416.8582253769.

It can be divided in two parts, 724 and 37779, that added together give a triangular number (38503 = T₂₇₇).

The spelling of 72437779 in words is "seventy-two million, four hundred thirty-seven thousand, seven hundred seventy-nine".