72343643 has 2 divisors, whose sum is σ = 72343644. Its totient is φ = 72343642.

The previous prime is 72343637. The next prime is 72343693. The reversal of 72343643 is 34634327.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72343643 is a prime.

It is a super-2 number, since 2×72343643² = 10467205365022898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72343613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36171821 + 36171822.

It is an arithmetic number, because the mean of its divisors is an integer number (36171822).

Almost surely, 2^72343643 is an apocalyptic number.

72343643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72343643 is an equidigital number, since it uses as much as digits as its factorization.

72343643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 32.

The square root of 72343643 is about 8505.5066280616. The cubic root of 72343643 is about 416.6775720523.

The spelling of 72343643 in words is "seventy-two million, three hundred forty-three thousand, six hundred forty-three".