127640587 has 4 divisors (see below), whose sum is σ = 128879920. Its totient is φ = 126401256.

The previous prime is 127640581. The next prime is 127640599. The reversal of 127640587 is 785046721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 785046721 = 41 ⋅19147481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127640587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127640581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619512 + ... + 619717.

It is an arithmetic number, because the mean of its divisors is an integer number (32219980).

Almost surely, 2^127640587 is an apocalyptic number.

127640587 is a deficient number, since it is larger than the sum of its proper divisors (1239333).

127640587 is a wasteful number, since it uses less digits than its factorization.

127640587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239332.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 127640587 is about 11297.8133725071. The cubic root of 127640587 is about 503.4962777658.

The spelling of 127640587 in words is "one hundred twenty-seven million, six hundred forty thousand, five hundred eighty-seven".