645087207 has 4 divisors (see below), whose sum is σ = 860116280. Its totient is φ = 430058136.

The previous prime is 645087197. The next prime is 645087211. The reversal of 645087207 is 702780546.

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

It is not a de Polignac number, because 645087207 - 2⁸ = 645086951 is a prime.

It is a super-2 number, since 2×645087207² = 832275009270121698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645087307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107514532 + ... + 107514537.

It is an arithmetic number, because the mean of its divisors is an integer number (215029070).

Almost surely, 2^645087207 is an apocalyptic number.

645087207 is a deficient number, since it is larger than the sum of its proper divisors (215029073).

645087207 is a wasteful number, since it uses less digits than its factorization.

645087207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215029072.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 645087207 is about 25398.5670265076. The cubic root of 645087207 is about 864.0511975084.

The spelling of 645087207 in words is "six hundred forty-five million, eighty-seven thousand, two hundred seven".