640545150 has 72 divisors (see below), whose sum is σ = 1847928600. Its totient is φ = 146408640.

The previous prime is 640545109. The next prime is 640545151. The reversal of 640545150 is 51545046.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640545151) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 36225 + ... + 50924.

It is an arithmetic number, because the mean of its divisors is an integer number (25665675).

Almost surely, 2^640545150 is an apocalyptic number.

640545150 is an abundant number, since it is smaller than the sum of its proper divisors (1207383450).

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

640545150 is a wasteful number, since it uses less digits than its factorization.

640545150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87178 (or 87166 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 640545150 is about 25308.9934608234. The cubic root of 640545150 is about 862.0184920030.

The spelling of 640545150 in words is "six hundred forty million, five hundred forty-five thousand, one hundred fifty".