1662786880 has 28 divisors (see below), whose sum is σ = 3959512020. Its totient is φ = 665114624.

The previous prime is 1662786869. The next prime is 1662786883. The reversal of 1662786880 is 886872661.

It can be written as a sum of positive squares in 2 ways, for example, as 1216056384 + 446730496 = 34872^2 + 21136^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662786883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2597785 + ... + 2598424.

Almost surely, 2^1662786880 is an apocalyptic number.

1662786880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662786880 is an abundant number, since it is smaller than the sum of its proper divisors (2296725140).

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

1662786880 is an equidigital number, since it uses as much as digits as its factorization.

1662786880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5196226 (or 5196216 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 52.

The square root of 1662786880 is about 40777.2838722738. The cubic root of 1662786880 is about 1184.7103875441.

The spelling of 1662786880 in words is "one billion, six hundred sixty-two million, seven hundred eighty-six thousand, eight hundred eighty".