645582 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 174528.

The previous prime is 645581. The next prime is 645583. The reversal of 645582 is 285546.

It is an interprime number because it is at equal distance from previous prime (645581) and next prime (645583).

It is a super-2 number, since 2×645582² = 833552237448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394 + ... + 1202.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶⁴⁵⁵⁸² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645582, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777600).

645582 is an abundant number, since it is smaller than the sum of its proper divisors (909618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645582 is a wasteful number, since it uses less digits than its factorization.

645582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840.

The product of its digits is 9600, while the sum is 30.

The square root of 645582 is about 803.4811758840. The cubic root of 645582 is about 86.4272055102.

The spelling of 645582 in words is "six hundred forty-five thousand, five hundred eighty-two".