660787138 has 32 divisors (see below), whose sum is σ = 1102818240. Its totient is φ = 294408000.

The previous prime is 660787123. The next prime is 660787139. The reversal of 660787138 is 831787066.

It is not an unprimeable number, because it can be changed into a prime (660787139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 701748 + ... + 702688.

It is an arithmetic number, because the mean of its divisors is an integer number (34463070).

Almost surely, 2^660787138 is an apocalyptic number.

660787138 is a deficient number, since it is larger than the sum of its proper divisors (442031102).

660787138 is a wasteful number, since it uses less digits than its factorization.

660787138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 660787138 is about 25705.7802449177. The cubic root of 660787138 is about 871.0047571648.

The spelling of 660787138 in words is "six hundred sixty million, seven hundred eighty-seven thousand, one hundred thirty-eight".