73644661 has 2 divisors, whose sum is σ = 73644662. Its totient is φ = 73644660.

The previous prime is 73644611. The next prime is 73644673. The reversal of 73644661 is 16644637.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61324561 + 12320100 = 7831^2 + 3510^2 .

It is a cyclic number.

It is not a de Polignac number, because 73644661 - 2⁷ = 73644533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73644661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73644611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36822330 + 36822331.

It is an arithmetic number, because the mean of its divisors is an integer number (36822331).

Almost surely, 2^73644661 is an apocalyptic number.

It is an amenable number.

73644661 is a deficient number, since it is larger than the sum of its proper divisors (1).

73644661 is an equidigital number, since it uses as much as digits as its factorization.

73644661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 37.

The square root of 73644661 is about 8581.6467533918. The cubic root of 73644661 is about 419.1605701853.

It can be divided in two parts, 73644 and 661, that added together give a triangular number (74305 = T₃₈₅).

The spelling of 73644661 in words is "seventy-three million, six hundred forty-four thousand, six hundred sixty-one".