645086 has 16 divisors (see below), whose sum is σ = 1068144. Its totient is φ = 290304.

The previous prime is 645083. The next prime is 645091. The reversal of 645086 is 680546.

It is a super-2 number, since 2×645086² = 832271894792, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 830 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (66759).

2⁶⁴⁵⁰⁸⁶ is an apocalyptic number.

645086 is a deficient number, since it is larger than the sum of its proper divisors (423058).

645086 is a wasteful number, since it uses less digits than its factorization.

645086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 645086 is about 803.1724596872. The cubic root of 645086 is about 86.4050658609.

The spelling of 645086 in words is "six hundred forty-five thousand, eighty-six".