862640 has 40 divisors (see below), whose sum is σ = 2062368. Its totient is φ = 335360.

The previous prime is 862633. The next prime is 862649. The reversal of 862640 is 46268.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (862649) 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, 3149 + ... + 3411.

2⁸⁶²⁶⁴⁰ is an apocalyptic number.

862640 is a gapful number since it is divisible by the number (80) 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 862640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031184).

862640 is an abundant number, since it is smaller than the sum of its proper divisors (1199728).

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

862640 is a wasteful number, since it uses less digits than its factorization.

862640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 862640 is about 928.7841514582. The cubic root of 862640 is about 95.1940631375.

The spelling of 862640 in words is "eight hundred sixty-two thousand, six hundred forty".