262640 has 60 divisors (see below), whose sum is σ = 720936. Its totient is φ = 88704.

The previous prime is 262627. The next prime is 262643. The reversal of 262640 is 46262.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a d-powerful number, because it can be written as 2¹⁷ + 6³ + 6³ + 2¹⁷ + 4³ + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (262643) by changing a digit.

262640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3887 + ... + 3953.

2²⁶²⁶⁴⁰ is an apocalyptic number.

262640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 262640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360468).

262640 is an abundant number, since it is smaller than the sum of its proper divisors (458296).

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

262640 is a wasteful number, since it uses less digits than its factorization.

262640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 262640 is about 512.4841460962. The cubic root of 262640 is about 64.0403391523.

The spelling of 262640 in words is "two hundred sixty-two thousand, six hundred forty".