640527537 has 16 divisors (see below), whose sum is σ = 920353280. Its totient is φ = 393904512.

The previous prime is 640527521. The next prime is 640527539. The reversal of 640527537 is 735725046.

640527537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640527537 - 2⁴ = 640527521 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640527495 and 640527504.

It is not an unprimeable number, because it can be changed into a prime (640527539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63933 + ... + 73269.

It is an arithmetic number, because the mean of its divisors is an integer number (57522080).

Almost surely, 2^640527537 is an apocalyptic number.

It is an amenable number.

640527537 is a deficient number, since it is larger than the sum of its proper divisors (279825743).

640527537 is a wasteful number, since it uses less digits than its factorization.

640527537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11112.

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 640527537 is about 25308.6454991175. The cubic root of 640527537 is about 862.0105909879.

The spelling of 640527537 in words is "six hundred forty million, five hundred twenty-seven thousand, five hundred thirty-seven".