127720 has 32 divisors (see below), whose sum is σ = 299520. Its totient is φ = 48960.

The previous prime is 127717. The next prime is 127727. The reversal of 127720 is 27721.

It is a Smith number, since the sum of its digits (19) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1189 + ... + 1291.

It is an arithmetic number, because the mean of its divisors is an integer number (9360).

2¹²⁷⁷²⁰ is an apocalyptic number.

127720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 127720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149760).

127720 is an abundant number, since it is smaller than the sum of its proper divisors (171800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

127720 is a wasteful number, since it uses less digits than its factorization.

127720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 127720 is about 357.3793502708. The cubic root of 127720 is about 50.3600674707.

Subtracting from 127720 its reverse (27721), we obtain a palindrome (99999).

The spelling of 127720 in words is "one hundred twenty-seven thousand, seven hundred twenty", and thus it is an iban number.