7713000781 has 4 divisors (see below), whose sum is σ = 7713181564. Its totient is φ = 7712820000.

The previous prime is 7713000769. The next prime is 7713000829. The reversal of 7713000781 is 1870003177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3905000100 + 3808000681 = 62490^2 + 61709^2 .

It is a 6-Lehmer number, since φ(7713000781) divides (7713000781-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 7713000781 - 2⁷ = 7713000653 is a prime.

It is a super-2 number, since 2×7713000781² (a number of 21 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 (7713000721) 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, 13111 + ... + 124891.

It is an arithmetic number, because the mean of its divisors is an integer number (1928295391).

Almost surely, 2^7713000781 is an apocalyptic number.

It is an amenable number.

7713000781 is a deficient number, since it is larger than the sum of its proper divisors (180783).

7713000781 is a wasteful number, since it uses less digits than its factorization.

7713000781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180782.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 7713000781 is about 87823.6914562352. The cubic root of 7713000781 is about 1975.7915563213.

The spelling of 7713000781 in words is "seven billion, seven hundred thirteen million, seven hundred eighty-one", and thus it is an aban number.