1720451490 has 16 divisors (see below), whose sum is σ = 4129083648. Its totient is φ = 458787056.

The previous prime is 1720451483. The next prime is 1720451521. The reversal of 1720451490 is 941540271.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28674162 + ... + 28674221.

It is an arithmetic number, because the mean of its divisors is an integer number (258067728).

Almost surely, 2^1720451490 is an apocalyptic number.

1720451490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720451490 is an abundant number, since it is smaller than the sum of its proper divisors (2408632158).

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

1720451490 is a wasteful number, since it uses less digits than its factorization.

1720451490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57348393.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1720451490 is about 41478.3255447951. The cubic root of 1720451490 is about 1198.2501091977.

The spelling of 1720451490 in words is "one billion, seven hundred twenty million, four hundred fifty-one thousand, four hundred ninety".