7890840052 has 12 divisors (see below), whose sum is σ = 13935658660. Its totient is φ = 3909223296.

The previous prime is 7890840047. The next prime is 7890840053. The reversal of 7890840052 is 2500480987.

It can be written as a sum of positive squares in 2 ways, for example, as 5775392016 + 2115448036 = 75996^2 + 45994^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7890839990 and 7890840008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7890840053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9048693 + ... + 9049564.

Almost surely, 2^7890840052 is an apocalyptic number.

It is an amenable number.

7890840052 is a deficient number, since it is larger than the sum of its proper divisors (6044818608).

7890840052 is a wasteful number, since it uses less digits than its factorization.

7890840052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18098370 (or 18098368 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 7890840052 is about 88830.4004944253. The cubic root of 7890840052 is about 1990.8616465094.

The spelling of 7890840052 in words is "seven billion, eight hundred ninety million, eight hundred forty thousand, fifty-two".