640577145 has 32 divisors (see below), whose sum is σ = 1106848512. Its totient is φ = 314479872.

The previous prime is 640577131. The next prime is 640577173. The reversal of 640577145 is 541775046.

It is not a de Polignac number, because 640577145 - 2⁴ = 640577129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68332 + ... + 77138.

It is an arithmetic number, because the mean of its divisors is an integer number (34589016).

Almost surely, 2^640577145 is an apocalyptic number.

640577145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

640577145 is a deficient number, since it is larger than the sum of its proper divisors (466271367).

640577145 is a wasteful number, since it uses less digits than its factorization.

640577145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9201.

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 640577145 is about 25309.6255404935. The cubic root of 640577145 is about 862.0328442687.

The spelling of 640577145 in words is "six hundred forty million, five hundred seventy-seven thousand, one hundred forty-five".