1662236640 has 168 divisors, whose sum is σ = 5888270808. Its totient is φ = 443232000.

The previous prime is 1662236627. The next prime is 1662236651. The reversal of 1662236640 is 466322661.

1662236640 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 2 + 3 + 6 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1662236595 and 1662236604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 109515 + ... + 123765.

It is an arithmetic number, because the mean of its divisors is an integer number (35049231).

Almost surely, 2^1662236640 is an apocalyptic number.

1662236640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1662236640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2944135404).

1662236640 is an abundant number, since it is smaller than the sum of its proper divisors (4226034168).

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

1662236640 is an equidigital number, since it uses as much as digits as its factorization.

1662236640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14284 (or 14261 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 1662236640 is about 40770.5364203122. The cubic root of 1662236640 is about 1184.5796939137.

The spelling of 1662236640 in words is "one billion, six hundred sixty-two million, two hundred thirty-six thousand, six hundred forty".