1720641888 has 72 divisors (see below), whose sum is σ = 5592092688. Its totient is φ = 491611392.

The previous prime is 1720641877. The next prime is 1720641907. The reversal of 1720641888 is 8881460271.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424731 + ... + 428762.

It is an arithmetic number, because the mean of its divisors is an integer number (77667954).

Almost surely, 2^1720641888 is an apocalyptic number.

1720641888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1720641888 is an abundant number, since it is smaller than the sum of its proper divisors (3871450800).

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

1720641888 is a wasteful number, since it uses less digits than its factorization.

1720641888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853516 (or 853505 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 1720641888 is about 41480.6206318083. The cubic root of 1720641888 is about 1198.2943100001.

The spelling of 1720641888 in words is "one billion, seven hundred twenty million, six hundred forty-one thousand, eight hundred eighty-eight".