1664707870 has 24 divisors (see below), whose sum is σ = 3485695464. Its totient is φ = 570756816.

The previous prime is 1664707867. The next prime is 1664707879. The reversal of 1664707870 is 787074661.

It is a self number, because there is not a number n which added to its sum of digits gives 1664707870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664707879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1698192 + ... + 1699171.

It is an arithmetic number, because the mean of its divisors is an integer number (145237311).

Almost surely, 2^1664707870 is an apocalyptic number.

1664707870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664707870 is an abundant number, since it is smaller than the sum of its proper divisors (1820987594).

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

1664707870 is a wasteful number, since it uses less digits than its factorization.

1664707870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397384 (or 3397377 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 1664707870 is about 40800.8317317184. The cubic root of 1664707870 is about 1185.1664373627.

The spelling of 1664707870 in words is "one billion, six hundred sixty-four million, seven hundred seven thousand, eight hundred seventy".