3681949658 has 16 divisors (see below), whose sum is σ = 5881614120. Its totient is φ = 1722663936.

The previous prime is 3681949657. The next prime is 3681949673. The reversal of 3681949658 is 8569491863.

It can be written as a sum of positive squares in 4 ways, for example, as 3667150249 + 14799409 = 60557^2 + 3847^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3681949597 and 3681949606.

It is not an unprimeable number, because it can be changed into a prime (3681949657) 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, 307103 + ... + 318866.

Almost surely, 2^3681949658 is an apocalyptic number.

3681949658 is a deficient number, since it is larger than the sum of its proper divisors (2199664462).

3681949658 is a wasteful number, since it uses less digits than its factorization.

3681949658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626161.

The product of its digits is 11197440, while the sum is 59.

The square root of 3681949658 is about 60679.0710047542. The cubic root of 3681949658 is about 1544.1611276113.

The spelling of 3681949658 in words is "three billion, six hundred eighty-one million, nine hundred forty-nine thousand, six hundred fifty-eight".