73677781 has 2 divisors, whose sum is σ = 73677782. Its totient is φ = 73677780.

The previous prime is 73677761. The next prime is 73677817. The reversal of 73677781 is 18777637.

Together with next prime (73677817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40844881 + 32832900 = 6391^2 + 5730^2 .

It is a cyclic number.

It is not a de Polignac number, because 73677781 - 2¹¹ = 73675733 is a prime.

It is a super-2 number, since 2×73677781² = 10856830826167922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73677701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36838890 + 36838891.

It is an arithmetic number, because the mean of its divisors is an integer number (36838891).

Almost surely, 2^73677781 is an apocalyptic number.

It is an amenable number.

73677781 is a deficient number, since it is larger than the sum of its proper divisors (1).

73677781 is an equidigital number, since it uses as much as digits as its factorization.

73677781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345744, while the sum is 46.

The square root of 73677781 is about 8583.5762360452. The cubic root of 73677781 is about 419.2233967242.

The spelling of 73677781 in words is "seventy-three million, six hundred seventy-seven thousand, seven hundred eighty-one".