645087 has 8 divisors (see below), whose sum is σ = 869040. Its totient is φ = 425600.

The previous prime is 645083. The next prime is 645091. The reversal of 645087 is 780546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645083) and next prime (645091).

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

It is a cyclic number.

It is not a de Polignac number, because 645087 - 2² = 645083 is a prime.

It is a super-2 number, since 2×645087² = 832274475138, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645087.

It is not an unprimeable number, because it can be changed into a prime (645083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 762 + ... + 1367.

It is an arithmetic number, because the mean of its divisors is an integer number (108630).

2⁶⁴⁵⁰⁸⁷ is an apocalyptic number.

645087 is a deficient number, since it is larger than the sum of its proper divisors (223953).

645087 is a wasteful number, since it uses less digits than its factorization.

645087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 645087 is about 803.1730822183. The cubic root of 645087 is about 86.4051105088.

It can be divided in two parts, 64 and 5087, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 645087 in words is "six hundred forty-five thousand, eighty-seven".