1664701764 has 24 divisors (see below), whose sum is σ = 4237423008. Its totient is φ = 504455040.

The previous prime is 1664701763. The next prime is 1664701793. The reversal of 1664701764 is 4671074661.

It is not an unprimeable number, because it can be changed into a prime (1664701763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6305557 + ... + 6305820.

It is an arithmetic number, because the mean of its divisors is an integer number (176559292).

Almost surely, 2^1664701764 is an apocalyptic number.

It is an amenable number.

1664701764 is an abundant number, since it is smaller than the sum of its proper divisors (2572721244).

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

1664701764 is a wasteful number, since it uses less digits than its factorization.

1664701764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12611395 (or 12611393 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 1664701764 is about 40800.7569047438. The cubic root of 1664701764 is about 1185.1649883327.

The spelling of 1664701764 in words is "one billion, six hundred sixty-four million, seven hundred one thousand, seven hundred sixty-four".