1720987770087 has 24 divisors (see below), whose sum is σ = 2708410856400. Its totient is φ = 1079835458688.

The previous prime is 1720987770079. The next prime is 1720987770097. The reversal of 1720987770087 is 7800777890271.

It is not a de Polignac number, because 1720987770087 - 2³ = 1720987770079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720987770097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110269512 + ... + 110285117.

It is an arithmetic number, because the mean of its divisors is an integer number (112850452350).

Almost surely, 2^{1720987770087} is an apocalyptic number.

1720987770087 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1720987770087 is a deficient number, since it is larger than the sum of its proper divisors (987423086313).

1720987770087 is a wasteful number, since it uses less digits than its factorization.

1720987770087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220554672 (or 220554649 counting only the distinct ones).

The product of its (nonzero) digits is 19361664, while the sum is 63.

The spelling of 1720987770087 in words is "one trillion, seven hundred twenty billion, nine hundred eighty-seven million, seven hundred seventy thousand, eighty-seven".