7890945938 has 18 divisors (see below), whose sum is σ = 12377953287. Its totient is φ = 3772548780.

The previous prime is 7890945899. The next prime is 7890945941. The reversal of 7890945938 is 8395490987.

It can be written as a sum of positive squares in only one way, i.e., 3945472969 + 3945472969 = 62813^2 + 62813^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=62813.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 2888033 + ... + 2890763.

Almost surely, 2^7890945938 is an apocalyptic number.

7890945938 is a deficient number, since it is larger than the sum of its proper divisors (4487007349).

7890945938 is an frugal number, since it uses more digits than its factorization.

7890945938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5510 (or 2756 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 62.

The square root of 7890945938 is about 88830.9964933412. The cubic root of 7890945938 is about 1990.8705514942.

The spelling of 7890945938 in words is "seven billion, eight hundred ninety million, nine hundred forty-five thousand, nine hundred thirty-eight".