1662173460 has 144 divisors (see below), whose sum is σ = 5271791616. Its totient is φ = 439592832.

The previous prime is 1662173449. The next prime is 1662173467. The reversal of 1662173460 is 643712661.

It is a happy number.

It is a super-2 number, since 2×1662173460² = 5525641222256743200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662173467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 615874 + ... + 618566.

It is an arithmetic number, because the mean of its divisors is an integer number (36609664).

Almost surely, 2^1662173460 is an apocalyptic number.

1662173460 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 1662173460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2635895808).

1662173460 is an abundant number, since it is smaller than the sum of its proper divisors (3609618156).

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

1662173460 is a wasteful number, since it uses less digits than its factorization.

1662173460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844 (or 2830 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 1662173460 is about 40769.7615887069. The cubic root of 1662173460 is about 1184.5646854824.

The spelling of 1662173460 in words is "one billion, six hundred sixty-two million, one hundred seventy-three thousand, four hundred sixty".