1640988844 has 48 divisors (see below), whose sum is σ = 3259662336. Its totient is φ = 716083200.

The previous prime is 1640988829. The next prime is 1640988851. The reversal of 1640988844 is 4488890461.

It is a super-2 number, since 2×1640988844² = 5385688772264912672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1640988791 and 1640988800.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168492 + ... + 177964.

It is an arithmetic number, because the mean of its divisors is an integer number (67909632).

Almost surely, 2^1640988844 is an apocalyptic number.

It is an amenable number.

1640988844 is a deficient number, since it is larger than the sum of its proper divisors (1618673492).

1640988844 is a wasteful number, since it uses less digits than its factorization.

1640988844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9646 (or 9644 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 52.

The square root of 1640988844 is about 40509.1205039063. The cubic root of 1640988844 is about 1179.5106761724.

The spelling of 1640988844 in words is "one billion, six hundred forty million, nine hundred eighty-eight thousand, eight hundred forty-four".