72943643 has 2 divisors, whose sum is σ = 72943644. Its totient is φ = 72943642.

The previous prime is 72943639. The next prime is 72943657. The reversal of 72943643 is 34634927.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72943643 - 2² = 72943639 is a prime.

It is a super-2 number, since 2×72943643² = 10641550108222898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72943597 and 72943606.

It is not a weakly prime, because it can be changed into another prime (72943043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36471821 + 36471822.

It is an arithmetic number, because the mean of its divisors is an integer number (36471822).

Almost surely, 2^72943643 is an apocalyptic number.

72943643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72943643 is an equidigital number, since it uses as much as digits as its factorization.

72943643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 38.

The square root of 72943643 is about 8540.7050645717. The cubic root of 72943643 is about 417.8263417125.

The spelling of 72943643 in words is "seventy-two million, nine hundred forty-three thousand, six hundred forty-three".