1720828807 has 2 divisors, whose sum is σ = 1720828808. Its totient is φ = 1720828806.

The previous prime is 1720828799. The next prime is 1720828831. The reversal of 1720828807 is 7088280271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1720828807 - 2³ = 1720828799 is a prime.

It is a super-2 number, since 2×1720828807² = 5922503566002086498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720828847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860414403 + 860414404.

It is an arithmetic number, because the mean of its divisors is an integer number (860414404).

Almost surely, 2^1720828807 is an apocalyptic number.

1720828807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720828807 is an equidigital number, since it uses as much as digits as its factorization.

1720828807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 1720828807 is about 41482.8736588969. The cubic root of 1720828807 is about 1198.3376999825.

The spelling of 1720828807 in words is "one billion, seven hundred twenty million, eight hundred twenty-eight thousand, eight hundred seven".