1640026844 has 6 divisors (see below), whose sum is σ = 2870046984. Its totient is φ = 820013420.

The previous prime is 1640026823. The next prime is 1640026847. The reversal of 1640026844 is 4486200461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640026847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205003352 + ... + 205003359.

It is an arithmetic number, because the mean of its divisors is an integer number (478341164).

Almost surely, 2^1640026844 is an apocalyptic number.

It is an amenable number.

1640026844 is a deficient number, since it is larger than the sum of its proper divisors (1230020140).

1640026844 is a wasteful number, since it uses less digits than its factorization.

1640026844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410006715 (or 410006713 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 1640026844 is about 40497.2448939431. The cubic root of 1640026844 is about 1179.2801421914.

The spelling of 1640026844 in words is "one billion, six hundred forty million, twenty-six thousand, eight hundred forty-four".