640628127 has 6 divisors (see below), whose sum is σ = 925351752. Its totient is φ = 427085412.

The previous prime is 640628123. The next prime is 640628159. The reversal of 640628127 is 721826046.

640628127 is a `hidden beast` number, since 6 + 4 + 0 + 628 + 1 + 27 = 666.

It is not a de Polignac number, because 640628127 - 2² = 640628123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640628091 and 640628100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640628123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35590443 + ... + 35590460.

It is an arithmetic number, because the mean of its divisors is an integer number (154225292).

Almost surely, 2^640628127 is an apocalyptic number.

640628127 is a deficient number, since it is larger than the sum of its proper divisors (284723625).

640628127 is a wasteful number, since it uses less digits than its factorization.

640628127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71180909 (or 71180906 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 640628127 is about 25310.6326866793. The cubic root of 640628127 is about 862.0557127048.

The spelling of 640628127 in words is "six hundred forty million, six hundred twenty-eight thousand, one hundred twenty-seven".