640252358 has 4 divisors (see below), whose sum is σ = 960378540. Its totient is φ = 320126178.

The previous prime is 640252313. The next prime is 640252373. The reversal of 640252358 is 853252046.

640252358 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 853252046 = 2 ⋅426626023.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160063088 + ... + 160063091.

It is an arithmetic number, because the mean of its divisors is an integer number (240094635).

Almost surely, 2^640252358 is an apocalyptic number.

640252358 is a deficient number, since it is larger than the sum of its proper divisors (320126182).

640252358 is a wasteful number, since it uses less digits than its factorization.

640252358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320126181.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 640252358 is about 25303.2084526844. The cubic root of 640252358 is about 861.8871296345.

The spelling of 640252358 in words is "six hundred forty million, two hundred fifty-two thousand, three hundred fifty-eight".