2006861787 has 96 divisors (see below), whose sum is σ = 3552972800. Its totient is φ = 1089728640.

The previous prime is 2006861777. The next prime is 2006861821. The reversal of 2006861787 is 7871686002.

2006861787 is a `hidden beast` number, since 20 + 0 + 6 + 8 + 617 + 8 + 7 = 666.

It is not a de Polignac number, because 2006861787 - 2⁴ = 2006861771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006861737) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6411543 + ... + 6411855.

Almost surely, 2^2006861787 is an apocalyptic number.

2006861787 is a deficient number, since it is larger than the sum of its proper divisors (1546111013).

2006861787 is a wasteful number, since it uses less digits than its factorization.

2006861787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 2006861787 is about 44798.0109714706. The cubic root of 2006861787 is about 1261.3602901678.

The spelling of 2006861787 in words is "two billion, six million, eight hundred sixty-one thousand, seven hundred eighty-seven".