740083807781 has 4 divisors (see below), whose sum is σ = 740710467564. Its totient is φ = 739457148000.

The previous prime is 740083807777. The next prime is 740083807847. The reversal of 740083807781 is 187708380047.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187708380047 = 383 ⋅490100209.

It can be written as a sum of positive squares in 2 ways, for example, as 605883208225 + 134200599556 = 778385^2 + 366334^2 .

It is a cyclic number.

It is not a de Polignac number, because 740083807781 - 2² = 740083807777 is a prime.

It is a super-2 number, since 2×740083807781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740083807681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313328120 + ... + 313330481.

It is an arithmetic number, because the mean of its divisors is an integer number (185177616891).

Almost surely, 2^740083807781 is an apocalyptic number.

It is an amenable number.

740083807781 is a deficient number, since it is larger than the sum of its proper divisors (626659783).

740083807781 is a wasteful number, since it uses less digits than its factorization.

740083807781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626659782.

The product of its (nonzero) digits is 2107392, while the sum is 53.

The spelling of 740083807781 in words is "seven hundred forty billion, eighty-three million, eight hundred seven thousand, seven hundred eighty-one".