2001329644 has 6 divisors (see below), whose sum is σ = 3502326884. Its totient is φ = 1000664820.

The previous prime is 2001329639. The next prime is 2001329669. The reversal of 2001329644 is 4469231002.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250166202 + ... + 250166209.

Almost surely, 2^2001329644 is an apocalyptic number.

It is an amenable number.

2001329644 is a deficient number, since it is larger than the sum of its proper divisors (1500997240).

2001329644 is a wasteful number, since it uses less digits than its factorization.

2001329644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500332415 (or 500332413 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 2001329644 is about 44736.2229518765. Note that the first 3 decimals coincide. The cubic root of 2001329644 is about 1260.2001957873.

The spelling of 2001329644 in words is "two billion, one million, three hundred twenty-nine thousand, six hundred forty-four".