3651978619 has 16 divisors (see below), whose sum is σ = 3902263200. Its totient is φ = 3407878656.

The previous prime is 3651978611. The next prime is 3651978623. The reversal of 3651978619 is 9168791563.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3651978619 - 2³ = 3651978611 is a prime.

It is a super-2 number, since 2×3651978619² = 26673895667266294322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3651978619.

It is not an unprimeable number, because it can be changed into a prime (3651978611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353187 + ... + 363379.

It is an arithmetic number, because the mean of its divisors is an integer number (243891450).

Almost surely, 2^3651978619 is an apocalyptic number.

3651978619 is a deficient number, since it is larger than the sum of its proper divisors (250284581).

3651978619 is a wasteful number, since it uses less digits than its factorization.

3651978619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10494.

The product of its digits is 2449440, while the sum is 55.

The square root of 3651978619 is about 60431.6028167382. The cubic root of 3651978619 is about 1539.9598880596.

The spelling of 3651978619 in words is "three billion, six hundred fifty-one million, nine hundred seventy-eight thousand, six hundred nineteen".