613990987 has 16 divisors (see below), whose sum is σ = 654451200. Its totient is φ = 574922880.

The previous prime is 613990981. The next prime is 613990999. The reversal of 613990987 is 789099316.

It is a cyclic number.

It is not a de Polignac number, because 613990987 - 2⁷ = 613990859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613990981) 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, 416662 + ... + 418132.

It is an arithmetic number, because the mean of its divisors is an integer number (40903200).

Almost surely, 2^613990987 is an apocalyptic number.

613990987 is a deficient number, since it is larger than the sum of its proper divisors (40460213).

613990987 is a wasteful number, since it uses less digits than its factorization.

613990987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 613990987 is about 24778.8415185214. The cubic root of 613990987 is about 849.9381671284.

The spelling of 613990987 in words is "six hundred thirteen million, nine hundred ninety thousand, nine hundred eighty-seven".