7543720906 has 16 divisors (see below), whose sum is σ = 11439543168. Its totient is φ = 3730618000.

The previous prime is 7543720889. The next prime is 7543720907. The reversal of 7543720906 is 6090273457.

It is not an unprimeable number, because it can be changed into a prime (7543720907) 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, 179571 + ... + 217561.

It is an arithmetic number, because the mean of its divisors is an integer number (714971448).

Almost surely, 2^7543720906 is an apocalyptic number.

7543720906 is a deficient number, since it is larger than the sum of its proper divisors (3895822262).

7543720906 is a wasteful number, since it uses less digits than its factorization.

7543720906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39077.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 7543720906 is about 86854.5963435442. The cubic root of 7543720906 is about 1961.2300437018.

The spelling of 7543720906 in words is "seven billion, five hundred forty-three million, seven hundred twenty thousand, nine hundred six".