1662845840 has 20 divisors (see below), whose sum is σ = 3866116764. Its totient is φ = 665138304.

The previous prime is 1662845839. The next prime is 1662845851. The reversal of 1662845840 is 485482661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 258695056 + 1404150784 = 16084^2 + 37472^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1662845791 and 1662845800.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10392707 + ... + 10392866.

Almost surely, 2^1662845840 is an apocalyptic number.

1662845840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662845840 is an abundant number, since it is smaller than the sum of its proper divisors (2203270924).

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

1662845840 is a wasteful number, since it uses less digits than its factorization.

1662845840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20785586 (or 20785580 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 1662845840 is about 40778.0068174010. The cubic root of 1662845840 is about 1184.7243900800.

The spelling of 1662845840 in words is "one billion, six hundred sixty-two million, eight hundred forty-five thousand, eight hundred forty".