7123689640 has 32 divisors (see below), whose sum is σ = 16545346560. Its totient is φ = 2757556800.

The previous prime is 7123689631. The next prime is 7123689641. The reversal of 7123689640 is 469863217.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (7123689641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2871216 + ... + 2873695.

It is an arithmetic number, because the mean of its divisors is an integer number (517042080).

Almost surely, 2^7123689640 is an apocalyptic number.

It is an amenable number.

7123689640 is an abundant number, since it is smaller than the sum of its proper divisors (9421656920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7123689640 is a wasteful number, since it uses less digits than its factorization.

7123689640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744953 (or 5744949 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 7123689640 is about 84401.9528210100. The cubic root of 7123689640 is about 1924.1325953198.

The spelling of 7123689640 in words is "seven billion, one hundred twenty-three million, six hundred eighty-nine thousand, six hundred forty".