1720669860 has 288 divisors, whose sum is σ = 6516357120. Its totient is φ = 357820416.

The previous prime is 1720669831. The next prime is 1720669921. The reversal of 1720669860 is 689660271.

It is a super-2 number, since 2×1720669860² = 5921409534224839200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1195021 + ... + 1196459.

It is an arithmetic number, because the mean of its divisors is an integer number (22626240).

Almost surely, 2^1720669860 is an apocalyptic number.

1720669860 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 1720669860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3258178560).

1720669860 is an abundant number, since it is smaller than the sum of its proper divisors (4795687260).

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

1720669860 is a wasteful number, since it uses less digits than its factorization.

1720669860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1542 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1720669860 is about 41480.9577999351. The cubic root of 1720669860 is about 1198.3008034115.

The spelling of 1720669860 in words is "one billion, seven hundred twenty million, six hundred sixty-nine thousand, eight hundred sixty".