72006437 has 2 divisors, whose sum is σ = 72006438. Its totient is φ = 72006436.

The previous prime is 72006433. The next prime is 72006457. The reversal of 72006437 is 73460027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69789316 + 2217121 = 8354^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 72006437 - 2² = 72006433 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72006433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36003218 + 36003219.

It is an arithmetic number, because the mean of its divisors is an integer number (36003219).

Almost surely, 2^72006437 is an apocalyptic number.

It is an amenable number.

72006437 is a deficient number, since it is larger than the sum of its proper divisors (1).

72006437 is an equidigital number, since it uses as much as digits as its factorization.

72006437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 72006437 is about 8485.6606696238. The cubic root of 72006437 is about 416.0291619257.

The spelling of 72006437 in words is "seventy-two million, six thousand, four hundred thirty-seven".