640064115 has 24 divisors (see below), whose sum is σ = 1167837840. Its totient is φ = 323400384.

The previous prime is 640064071. The next prime is 640064119. The reversal of 640064115 is 511460046.

640064115 is a `hidden beast` number, since 6 + 4 + 0 + 0 + 641 + 15 = 666.

640064115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640064115 - 2⁸ = 640063859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640064119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 373452 + ... + 375161.

It is an arithmetic number, because the mean of its divisors is an integer number (48659910).

Almost surely, 2^640064115 is an apocalyptic number.

640064115 is a deficient number, since it is larger than the sum of its proper divisors (527773725).

640064115 is a wasteful number, since it uses less digits than its factorization.

640064115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748643 (or 748640 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 640064115 is about 25299.4884335632. The cubic root of 640064115 is about 861.8026524644.

It can be divided in two parts, 64006 and 4115, that added together give a square (68121 = 261²).

The spelling of 640064115 in words is "six hundred forty million, sixty-four thousand, one hundred fifteen".