645587707 has 4 divisors (see below), whose sum is σ = 651510640. Its totient is φ = 639664776.

The previous prime is 645587689. The next prime is 645587711. The reversal of 645587707 is 707785546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645587707 - 2¹⁵ = 645554939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645587777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2961303 + ... + 2961520.

It is an arithmetic number, because the mean of its divisors is an integer number (162877660).

Almost surely, 2^645587707 is an apocalyptic number.

645587707 is a deficient number, since it is larger than the sum of its proper divisors (5922933).

645587707 is a wasteful number, since it uses less digits than its factorization.

645587707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922932.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The square root of 645587707 is about 25408.4180341870. The cubic root of 645587707 is about 864.2746018405.

The spelling of 645587707 in words is "six hundred forty-five million, five hundred eighty-seven thousand, seven hundred seven".