720515138 has 16 divisors (see below), whose sum is σ = 1263894720. Its totient is φ = 301610736.

The previous prime is 720515137. The next prime is 720515143. The reversal of 720515138 is 831515027.

It is not an unprimeable number, because it can be changed into a prime (720515137) 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, 597833 + ... + 599036.

It is an arithmetic number, because the mean of its divisors is an integer number (78993420).

Almost surely, 2^720515138 is an apocalyptic number.

720515138 is a deficient number, since it is larger than the sum of its proper divisors (543379582).

720515138 is a wasteful number, since it uses less digits than its factorization.

720515138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196921.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 720515138 is about 26842.4130435399. The cubic root of 720515138 is about 896.4946522312.

The spelling of 720515138 in words is "seven hundred twenty million, five hundred fifteen thousand, one hundred thirty-eight".