1720720130 has 16 divisors (see below), whose sum is σ = 3143525760. Its totient is φ = 678014832.

The previous prime is 1720720097. The next prime is 1720720159. The reversal of 1720720130 is 310270271.

It is a junction number, because it is equal to n+sod(n) for n = 1720720096 and 1720720105.

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, 1283450 + ... + 1284789.

It is an arithmetic number, because the mean of its divisors is an integer number (196470360).

Almost surely, 2^1720720130 is an apocalyptic number.

1720720130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720720130 is a deficient number, since it is larger than the sum of its proper divisors (1422805630).

1720720130 is a wasteful number, since it uses less digits than its factorization.

1720720130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568313.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 1720720130 is about 41481.5637361949. The cubic root of 1720720130 is about 1198.3124728967.

The spelling of 1720720130 in words is "one billion, seven hundred twenty million, seven hundred twenty thousand, one hundred thirty".