3990872644 has 24 divisors (see below), whose sum is σ = 7662993408. Its totient is φ = 1803543840.

The previous prime is 3990872581. The next prime is 3990872681. The reversal of 3990872644 is 4462780993.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3990872591 and 3990872600.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 254532 + ... + 269755.

It is an arithmetic number, because the mean of its divisors is an integer number (319291392).

Almost surely, 2^3990872644 is an apocalyptic number.

It is an amenable number.

3990872644 is a deficient number, since it is larger than the sum of its proper divisors (3672120764).

3990872644 is a wasteful number, since it uses less digits than its factorization.

3990872644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524475 (or 524473 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 3990872644 is about 63173.3539081154. The cubic root of 3990872644 is about 1586.1927345634.

The spelling of 3990872644 in words is "three billion, nine hundred ninety million, eight hundred seventy-two thousand, six hundred forty-four".