307645 has 8 divisors (see below), whose sum is σ = 397656. Its totient is φ = 227136.

The previous prime is 307639. The next prime is 307651. The reversal of 307645 is 546703.

It is an interprime number because it is at equal distance from previous prime (307639) and next prime (307651).

It can be written as a sum of positive squares in 4 ways, for example, as 729 + 306916 = 27^2 + 554^2 .

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

It is not a de Polignac number, because 307645 - 2¹¹ = 305597 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2302 + ... + 2431.

It is an arithmetic number, because the mean of its divisors is an integer number (49707).

2³⁰⁷⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

307645 is a deficient number, since it is larger than the sum of its proper divisors (90011).

307645 is a wasteful number, since it uses less digits than its factorization.

307645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4751.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 307645 is about 554.6575520084. The cubic root of 307645 is about 67.5071780204.

The spelling of 307645 in words is "three hundred seven thousand, six hundred forty-five".