1720001772 has 18 divisors (see below), whose sum is σ = 4347782348. Its totient is φ = 573333912.

The previous prime is 1720001753. The next prime is 1720001813. The reversal of 1720001772 is 2771000271.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23888878 + ... + 23888949.

Almost surely, 2^1720001772 is an apocalyptic number.

1720001772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1720001772 is an abundant number, since it is smaller than the sum of its proper divisors (2627780576).

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

1720001772 is a wasteful number, since it uses less digits than its factorization.

1720001772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47777837 (or 47777832 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 1720001772 is about 41472.9040700070. The cubic root of 1720001772 is about 1198.1456944350.

The spelling of 1720001772 in words is "one billion, seven hundred twenty million, one thousand, seven hundred seventy-two".