640070515 has 16 divisors (see below), whose sum is σ = 878258880. Its totient is φ = 438681600.

The previous prime is 640070507. The next prime is 640070539. The reversal of 640070515 is 515070046.

It is not a de Polignac number, because 640070515 - 2³ = 640070507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94771 + ... + 101299.

It is an arithmetic number, because the mean of its divisors is an integer number (54891180).

Almost surely, 2^640070515 is an apocalyptic number.

640070515 is a deficient number, since it is larger than the sum of its proper divisors (238188365).

640070515 is a wasteful number, since it uses less digits than its factorization.

640070515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 640070515 is about 25299.6149180180. The cubic root of 640070515 is about 861.8055248425.

The spelling of 640070515 in words is "six hundred forty million, seventy thousand, five hundred fifteen".