127280640 has 80 divisors (see below), whose sum is σ = 406924848. Its totient is φ = 33939456.

The previous prime is 127280609. The next prime is 127280651. The reversal of 127280640 is 46082721.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×127280640² = 32400722637619200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 127280598 and 127280607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607 + ... + 15966.

Almost surely, 2^127280640 is an apocalyptic number.

127280640 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 127280640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203462424).

127280640 is an abundant number, since it is smaller than the sum of its proper divisors (279644208).

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

127280640 is an equidigital number, since it uses as much as digits as its factorization.

127280640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16599 (or 16583 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 127280640 is about 11281.8721850586. The cubic root of 127280640 is about 503.0225449595.

The spelling of 127280640 in words is "one hundred twenty-seven million, two hundred eighty thousand, six hundred forty".