1720623261 has 128 divisors (see below), whose sum is σ = 3135283200. Its totient is φ = 815063040.

The previous prime is 1720623251. The next prime is 1720623269. The reversal of 1720623261 is 1623260271.

It is not a de Polignac number, because 1720623261 - 2¹¹ = 1720621213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720623269) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6396235 + ... + 6396503.

It is an arithmetic number, because the mean of its divisors is an integer number (24494400).

Almost surely, 2^1720623261 is an apocalyptic number.

It is an amenable number.

1720623261 is a deficient number, since it is larger than the sum of its proper divisors (1414659939).

1720623261 is a wasteful number, since it uses less digits than its factorization.

1720623261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1720623261 is about 41480.3961046661. The cubic root of 1720623261 is about 1198.2899858951.

The spelling of 1720623261 in words is "one billion, seven hundred twenty million, six hundred twenty-three thousand, two hundred sixty-one".