646086887 has 8 divisors (see below), whose sum is σ = 720097200. Its totient is φ = 576077184.

The previous prime is 646086877. The next prime is 646086923. The reversal of 646086887 is 788680646.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646086887 - 2¹² = 646082791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646086817) 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, 999812 + ... + 1000457.

It is an arithmetic number, because the mean of its divisors is an integer number (90012150).

Almost surely, 2^646086887 is an apocalyptic number.

646086887 is a deficient number, since it is larger than the sum of its proper divisors (74010313).

646086887 is a wasteful number, since it uses less digits than its factorization.

646086887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000305.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The square root of 646086887 is about 25418.2392584538. The cubic root of 646086887 is about 864.4973019955.

The spelling of 646086887 in words is "six hundred forty-six million, eighty-six thousand, eight hundred eighty-seven".