7720990426 has 8 divisors (see below), whose sum is σ = 11582161344. Its totient is φ = 3860269980.

The previous prime is 7720990397. The next prime is 7720990427. The reversal of 7720990426 is 6240990277.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7720990426² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7720990427) 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, 65890 + ... + 140653.

It is an arithmetic number, because the mean of its divisors is an integer number (1447770168).

Almost surely, 2^7720990426 is an apocalyptic number.

7720990426 is a deficient number, since it is larger than the sum of its proper divisors (3861170918).

7720990426 is a wasteful number, since it uses less digits than its factorization.

7720990426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225236.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 7720990426 is about 87869.1665261484. The cubic root of 7720990426 is about 1976.4735401571.

The spelling of 7720990426 in words is "seven billion, seven hundred twenty million, nine hundred ninety thousand, four hundred twenty-six".