1640993684 has 24 divisors (see below), whose sum is σ = 3160539648. Its totient is φ = 739303040.

The previous prime is 1640993671. The next prime is 1640993687. The reversal of 1640993684 is 4863990461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640993687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160052 + ... + 169995.

It is an arithmetic number, because the mean of its divisors is an integer number (131689152).

Almost surely, 2^1640993684 is an apocalyptic number.

It is an amenable number.

1640993684 is a deficient number, since it is larger than the sum of its proper divisors (1519545964).

1640993684 is a wasteful number, since it uses less digits than its factorization.

1640993684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330175 (or 330173 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 1640993684 is about 40509.1802434954. The cubic root of 1640993684 is about 1179.5118358037.

The spelling of 1640993684 in words is "one billion, six hundred forty million, nine hundred ninety-three thousand, six hundred eighty-four".