1640560740 has 288 divisors, whose sum is σ = 5888090880. Its totient is φ = 333785088.

The previous prime is 1640560717. The next prime is 1640560783. The reversal of 1640560740 is 470650461.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2058022 + ... + 2058818.

It is an arithmetic number, because the mean of its divisors is an integer number (20444760).

Almost surely, 2^1640560740 is an apocalyptic number.

1640560740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640560740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2944045440).

1640560740 is an abundant number, since it is smaller than the sum of its proper divisors (4247530140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640560740 is a wasteful number, since it uses less digits than its factorization.

1640560740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871 (or 856 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 1640560740 is about 40503.8361146201. The cubic root of 1640560740 is about 1179.4080963249.

The spelling of 1640560740 in words is "one billion, six hundred forty million, five hundred sixty thousand, seven hundred forty".