3671989649 has 6 divisors (see below), whose sum is σ = 3794262930. Its totient is φ = 3553537440.

The previous prime is 3671989639. The next prime is 3671989669. The reversal of 3671989649 is 9469891763.

It can be written as a sum of positive squares in only one way, i.e., 3278364049 + 393625600 = 57257^2 + 19840^2 .

It is not a de Polignac number, because 3671989649 - 2⁸ = 3671989393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3671989591 and 3671989600.

It is not an unprimeable number, because it can be changed into a prime (3671989639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1909544 + ... + 1911465.

It is an arithmetic number, because the mean of its divisors is an integer number (632377155).

Almost surely, 2^3671989649 is an apocalyptic number.

It is an amenable number.

3671989649 is a deficient number, since it is larger than the sum of its proper divisors (122273281).

3671989649 is an equidigital number, since it uses as much as digits as its factorization.

3671989649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3821071 (or 3821040 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 62.

The square root of 3671989649 is about 60596.9442216355. The cubic root of 3671989649 is about 1542.7675047566.

The spelling of 3671989649 in words is "three billion, six hundred seventy-one million, nine hundred eighty-nine thousand, six hundred forty-nine".