7390806781 has 2 divisors, whose sum is σ = 7390806782. Its totient is φ = 7390806780.

The previous prime is 7390806767. The next prime is 7390806809. The reversal of 7390806781 is 1876080937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4728762756 + 2662044025 = 68766^2 + 51595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7390806781 is a prime.

It is a super-2 number, since 2×7390806781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7390806701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3695403390 + 3695403391.

It is an arithmetic number, because the mean of its divisors is an integer number (3695403391).

Almost surely, 2^7390806781 is an apocalyptic number.

It is an amenable number.

7390806781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7390806781 is an equidigital number, since it uses as much as digits as its factorization.

7390806781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 7390806781 is about 85969.8015642702. The cubic root of 7390806781 is about 1947.8878538355.

The spelling of 7390806781 in words is "seven billion, three hundred ninety million, eight hundred six thousand, seven hundred eighty-one".