1720987572 has 24 divisors (see below), whose sum is σ = 4053170016. Its totient is φ = 568300768.

The previous prime is 1720987547. The next prime is 1720987601. The reversal of 1720987572 is 2757890271.

It is a happy number.

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, 668883 + ... + 671450.

It is an arithmetic number, because the mean of its divisors is an integer number (168882084).

Almost surely, 2^1720987572 is an apocalyptic number.

1720987572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1720987572 is an abundant number, since it is smaller than the sum of its proper divisors (2332182444).

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

1720987572 is a wasteful number, since it uses less digits than its factorization.

1720987572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340447 (or 1340445 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 48.

The square root of 1720987572 is about 41484.7872358049. The cubic root of 1720987572 is about 1198.3745520377.

The spelling of 1720987572 in words is "one billion, seven hundred twenty million, nine hundred eighty-seven thousand, five hundred seventy-two".