67440643 has 2 divisors, whose sum is σ = 67440644. Its totient is φ = 67440642.

The previous prime is 67440619. The next prime is 67440673. The reversal of 67440643 is 34604476.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67440643 - 2²¹ = 65343491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67440599 and 67440608.

It is not a weakly prime, because it can be changed into another prime (67440673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33720321 + 33720322.

It is an arithmetic number, because the mean of its divisors is an integer number (33720322).

Almost surely, 2^67440643 is an apocalyptic number.

67440643 is a deficient number, since it is larger than the sum of its proper divisors (1).

67440643 is an equidigital number, since it uses as much as digits as its factorization.

67440643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 67440643 is about 8212.2252161031. The cubic root of 67440643 is about 407.0432595729.

The spelling of 67440643 in words is "sixty-seven million, four hundred forty thousand, six hundred forty-three".