640546854 has 16 divisors (see below), whose sum is σ = 1312340400. Its totient is φ = 208307840.

The previous prime is 640546853. The next prime is 640546861. The reversal of 640546854 is 458645046.

640546854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×640546854³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640546853) 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, 1301679 + ... + 1302170.

It is an arithmetic number, because the mean of its divisors is an integer number (82021275).

Almost surely, 2^640546854 is an apocalyptic number.

640546854 is an abundant number, since it is smaller than the sum of its proper divisors (671793546).

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

640546854 is a wasteful number, since it uses less digits than its factorization.

640546854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603895.

The product of its (nonzero) digits is 460800, while the sum is 42.

The square root of 640546854 is about 25309.0271247237. The cubic root of 640546854 is about 862.0192563927.

The spelling of 640546854 in words is "six hundred forty million, five hundred forty-six thousand, eight hundred fifty-four".