73705781 has 2 divisors, whose sum is σ = 73705782. Its totient is φ = 73705780.

The previous prime is 73705759. The next prime is 73705787. The reversal of 73705781 is 18750737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58767556 + 14938225 = 7666^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 73705781 - 2⁶ = 73705717 is a prime.

It is a super-2 number, since 2×73705781² = 10865084305639922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73705787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36852890 + 36852891.

It is an arithmetic number, because the mean of its divisors is an integer number (36852891).

Almost surely, 2^73705781 is an apocalyptic number.

It is an amenable number.

73705781 is a deficient number, since it is larger than the sum of its proper divisors (1).

73705781 is an equidigital number, since it uses as much as digits as its factorization.

73705781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 73705781 is about 8585.2071029184. The cubic root of 73705781 is about 419.2764962624.

The spelling of 73705781 in words is "seventy-three million, seven hundred five thousand, seven hundred eighty-one".