1640000845 has 48 divisors (see below), whose sum is σ = 2371258368. Its totient is φ = 1085011200.

The previous prime is 1640000821. The next prime is 1640000849. The reversal of 1640000845 is 5480000461.

It is not a de Polignac number, because 1640000845 - 2¹⁹ = 1639476557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640000849) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 839620 + ... + 841570.

It is an arithmetic number, because the mean of its divisors is an integer number (49401216).

Almost surely, 2^1640000845 is an apocalyptic number.

It is an amenable number.

1640000845 is a deficient number, since it is larger than the sum of its proper divisors (731257523).

1640000845 is a wasteful number, since it uses less digits than its factorization.

1640000845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090 (or 2083 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1640000845 is about 40496.9238955257. The cubic root of 1640000845 is about 1179.2739105319.

The spelling of 1640000845 in words is "one billion, six hundred forty million, eight hundred forty-five", and thus it is an aban number.