127643640 has 64 divisors (see below), whose sum is σ = 383961600. Its totient is φ = 33946752.

The previous prime is 127643569. The next prime is 127643683. The reversal of 127643640 is 46346721.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51469 + ... + 53891.

It is an arithmetic number, because the mean of its divisors is an integer number (5999400).

Almost surely, 2^127643640 is an apocalyptic number.

127643640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

127643640 is an abundant number, since it is smaller than the sum of its proper divisors (256317960).

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

127643640 is a wasteful number, since it uses less digits than its factorization.

127643640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876 (or 2872 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 127643640 is about 11297.9484863403. The cubic root of 127643640 is about 503.5002920633.

The spelling of 127643640 in words is "one hundred twenty-seven million, six hundred forty-three thousand, six hundred forty".