640427045 has 8 divisors (see below), whose sum is σ = 769516440. Its totient is φ = 511672320.

The previous prime is 640427041. The next prime is 640427059. The reversal of 640427045 is 540724046.

It can be written as a sum of positive squares in 4 ways, for example, as 126135361 + 514291684 = 11231^2 + 22678^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640427045 - 2² = 640427041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640427041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79436 + ... + 87125.

It is an arithmetic number, because the mean of its divisors is an integer number (96189555).

Almost surely, 2^640427045 is an apocalyptic number.

It is an amenable number.

640427045 is a deficient number, since it is larger than the sum of its proper divisors (129089395).

640427045 is a wasteful number, since it uses less digits than its factorization.

640427045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167335.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 640427045 is about 25306.6600917624. The cubic root of 640427045 is about 861.9655085134.

The spelling of 640427045 in words is "six hundred forty million, four hundred twenty-seven thousand, forty-five".