640154193 has 64 divisors (see below), whose sum is σ = 1098842112. Its totient is φ = 322882560.

The previous prime is 640154161. The next prime is 640154231. The reversal of 640154193 is 391451046.

It is not a de Polignac number, because 640154193 - 2⁵ = 640154161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640154393) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 434448 + ... + 435918.

It is an arithmetic number, because the mean of its divisors is an integer number (17169408).

Almost surely, 2^640154193 is an apocalyptic number.

It is an amenable number.

640154193 is a deficient number, since it is larger than the sum of its proper divisors (458687919).

640154193 is a wasteful number, since it uses less digits than its factorization.

640154193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 640154193 is about 25301.2686045582. The cubic root of 640154193 is about 861.8430785280.

The spelling of 640154193 in words is "six hundred forty million, one hundred fifty-four thousand, one hundred ninety-three".