7909778690 has 32 divisors (see below), whose sum is σ = 15650521920. Its totient is φ = 2854321600.

The previous prime is 7909778689. The next prime is 7909778731. The reversal of 7909778690 is 968779097.

It is a happy number.

It is a super-2 number, since 2×7909778690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260045 + ... + 288864.

It is an arithmetic number, because the mean of its divisors is an integer number (489078810).

Almost surely, 2^7909778690 is an apocalyptic number.

7909778690 is a deficient number, since it is larger than the sum of its proper divisors (7740743230).

7909778690 is a wasteful number, since it uses less digits than its factorization.

7909778690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549058.

The product of its (nonzero) digits is 12002256, while the sum is 62.

The square root of 7909778690 is about 88936.9365899231. The cubic root of 7909778690 is about 1992.4531155875.

The spelling of 7909778690 in words is "seven billion, nine hundred nine million, seven hundred seventy-eight thousand, six hundred ninety".