1667243620 has 36 divisors (see below), whose sum is σ = 4072840380. Its totient is φ = 571626048.

The previous prime is 1667243609. The next prime is 1667243621. The reversal of 1667243620 is 263427661.

It can be written as a sum of positive squares in 2 ways, for example, as 732351844 + 934891776 = 27062^2 + 30576^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1667243620.

It is not an unprimeable number, because it can be changed into a prime (1667243621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 849655 + ... + 851614.

It is an arithmetic number, because the mean of its divisors is an integer number (113134455).

Almost surely, 2^1667243620 is an apocalyptic number.

1667243620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1667243620 is an abundant number, since it is smaller than the sum of its proper divisors (2405596760).

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

1667243620 is a wasteful number, since it uses less digits than its factorization.

1667243620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701292 (or 1701283 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 1667243620 is about 40831.8946413218. The cubic root of 1667243620 is about 1185.7678964763.

The spelling of 1667243620 in words is "one billion, six hundred sixty-seven million, two hundred forty-three thousand, six hundred twenty".