1720622061 has 8 divisors (see below), whose sum is σ = 2549069760. Its totient is φ = 1147081356.

The previous prime is 1720622053. The next prime is 1720622069. The reversal of 1720622061 is 1602260271.

1720622061 is a `hidden beast` number, since 17 + 20 + 622 + 0 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1720622053) and next prime (1720622069).

It is not a de Polignac number, because 1720622061 - 2³ = 1720622053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 63726743 = 1720622061 / (1 + 7 + 2 + 0 + 6 + 2 + 2 + 0 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720622069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31863345 + ... + 31863398.

It is an arithmetic number, because the mean of its divisors is an integer number (318633720).

Almost surely, 2^1720622061 is an apocalyptic number.

It is an amenable number.

1720622061 is a deficient number, since it is larger than the sum of its proper divisors (828447699).

1720622061 is an equidigital number, since it uses as much as digits as its factorization.

1720622061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63726752 (or 63726746 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1720622061 is about 41480.3816399994. The cubic root of 1720622061 is about 1198.2897073239.

The spelling of 1720622061 in words is "one billion, seven hundred twenty million, six hundred twenty-two thousand, sixty-one".