640851252 has 24 divisors (see below), whose sum is σ = 1498883232. Its totient is φ = 213108000.

The previous prime is 640851241. The next prime is 640851257. The reversal of 640851252 is 252158046.

It is a super-3 number, since 3×640851252³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640851257) 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, 58374 + ... + 68477.

It is an arithmetic number, because the mean of its divisors is an integer number (62453468).

Almost surely, 2^640851252 is an apocalyptic number.

It is an amenable number.

640851252 is an abundant number, since it is smaller than the sum of its proper divisors (858031980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640851252 is a wasteful number, since it uses less digits than its factorization.

640851252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127279 (or 127277 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 640851252 is about 25315.0400355204. The cubic root of 640851252 is about 862.1557831650.

The spelling of 640851252 in words is "six hundred forty million, eight hundred fifty-one thousand, two hundred fifty-two".