640002115 has 8 divisors (see below), whose sum is σ = 776632320. Its totient is φ = 506248512.

The previous prime is 640002113. The next prime is 640002119. The reversal of 640002115 is 511200046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640002115 - 2¹ = 640002113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640002092 and 640002101.

It is not an unprimeable number, because it can be changed into a prime (640002113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718659 + ... + 719548.

It is an arithmetic number, because the mean of its divisors is an integer number (97079040).

Almost surely, 2^640002115 is an apocalyptic number.

640002115 is a deficient number, since it is larger than the sum of its proper divisors (136630205).

640002115 is a wasteful number, since it uses less digits than its factorization.

640002115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438301.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 640002115 is about 25298.2630826703. The cubic root of 640002115 is about 861.7748253095.

The spelling of 640002115 in words is "six hundred forty million, two thousand, one hundred fifteen".