1721977696 has 48 divisors (see below), whose sum is σ = 3512088720. Its totient is φ = 830494720.

The previous prime is 1721977667. The next prime is 1721977711. The reversal of 1721977696 is 6967791271.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109395 + ... + 124141.

It is an arithmetic number, because the mean of its divisors is an integer number (73168515).

Almost surely, 2^1721977696 is an apocalyptic number.

1721977696 is a gapful number since it is divisible by the number (16) 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 1721977696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1756044360).

1721977696 is an abundant number, since it is smaller than the sum of its proper divisors (1790111024).

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

1721977696 is a wasteful number, since it uses less digits than its factorization.

1721977696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14887 (or 14879 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 55.

The square root of 1721977696 is about 41496.7190992252. The cubic root of 1721977696 is about 1198.6043255214.

The spelling of 1721977696 in words is "one billion, seven hundred twenty-one million, nine hundred seventy-seven thousand, six hundred ninety-six".