1870661664 has 144 divisors (see below), whose sum is σ = 5485439232. Its totient is φ = 604391424.

The previous prime is 1870661627. The next prime is 1870661669. The reversal of 1870661664 is 4661660781.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×1870661664² = 6998750122318497792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1870661669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1528957 + ... + 1530179.

It is an arithmetic number, because the mean of its divisors is an integer number (38093328).

Almost surely, 2^1870661664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1870661664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2742719616).

1870661664 is an abundant number, since it is smaller than the sum of its proper divisors (3614777568).

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

1870661664 is a wasteful number, since it uses less digits than its factorization.

1870661664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1388 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1870661664 is about 43251.1463894311. The cubic root of 1870661664 is about 1232.1542576848.

The spelling of 1870661664 in words is "one billion, eight hundred seventy million, six hundred sixty-one thousand, six hundred sixty-four".