1720979055 has 120 divisors (see below), whose sum is σ = 3319272000. Its totient is φ = 852778368.

The previous prime is 1720979041. The next prime is 1720979069. The reversal of 1720979055 is 5509790271.

It is an interprime number because it is at equal distance from previous prime (1720979041) and next prime (1720979069).

It is not a de Polignac number, because 1720979055 - 2⁶ = 1720978991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1720979055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 11550121 + ... + 11550269.

It is an arithmetic number, because the mean of its divisors is an integer number (27660600).

Almost surely, 2^1720979055 is an apocalyptic number.

1720979055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1720979055 is a deficient number, since it is larger than the sum of its proper divisors (1598292945).

1720979055 is a wasteful number, since it uses less digits than its factorization.

1720979055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 45.

The square root of 1720979055 is about 41484.6845835906. The cubic root of 1720979055 is about 1198.3725751547.

The spelling of 1720979055 in words is "one billion, seven hundred twenty million, nine hundred seventy-nine thousand, fifty-five".