1721620272 has 40 divisors (see below), whose sum is σ = 4497502320. Its totient is φ = 567424000.

The previous prime is 1721620259. The next prime is 1721620273. The reversal of 1721620272 is 2720261271.

It is a super-2 number, since 2×1721620272² = 5927952721922707968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1721620273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197229 + ... + 205772.

It is an arithmetic number, because the mean of its divisors is an integer number (112437558).

Almost surely, 2^1721620272 is an apocalyptic number.

1721620272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1721620272 is an abundant number, since it is smaller than the sum of its proper divisors (2775882048).

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

1721620272 is a wasteful number, since it uses less digits than its factorization.

1721620272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403101 (or 403095 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 1721620272 is about 41492.4122219955. The cubic root of 1721620272 is about 1198.5213899530.

The spelling of 1721620272 in words is "one billion, seven hundred twenty-one million, six hundred twenty thousand, two hundred seventy-two".