127665720 has 320 divisors, whose sum is σ = 529341120. Its totient is φ = 26873856.

The previous prime is 127665701. The next prime is 127665749. The reversal of 127665720 is 27566721.

127665720 is a `hidden beast` number, since 1 + 27 + 66 + 572 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 294624 + ... + 295056.

It is an arithmetic number, because the mean of its divisors is an integer number (1654191).

Almost surely, 2^127665720 is an apocalyptic number.

127665720 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 127665720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264670560).

127665720 is an abundant number, since it is smaller than the sum of its proper divisors (401675400).

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

127665720 is a wasteful number, since it uses less digits than its factorization.

127665720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 127665720 is about 11298.9256126412. The cubic root of 127665720 is about 503.5293224834.

The spelling of 127665720 in words is "one hundred twenty-seven million, six hundred sixty-five thousand, seven hundred twenty".