1668702312 has 24 divisors (see below), whose sum is σ = 4519402290. Its totient is φ = 556234080.

The previous prime is 1668702293. The next prime is 1668702313. The reversal of 1668702312 is 2132078661.

It can be written as a sum of positive squares in only one way, i.e., 1655350596 + 13351716 = 40686^2 + 3654^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1668702313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11588139 + ... + 11588282.

Almost surely, 2^1668702312 is an apocalyptic number.

1668702312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1668702312 is an abundant number, since it is smaller than the sum of its proper divisors (2850699978).

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

1668702312 is a wasteful number, since it uses less digits than its factorization.

1668702312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23176433 (or 23176426 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1668702312 is about 40849.7529001094. The cubic root of 1668702312 is about 1186.1136099905.

The spelling of 1668702312 in words is "one billion, six hundred sixty-eight million, seven hundred two thousand, three hundred twelve".