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640862 = 2320431
BaseRepresentation
bin10011100011101011110
31012120002122
42130131132
5131001422
621422542
75306255
oct2343536
91176078
10640862
113a8542
1226aa52
13195911
1412979c
15c9d42
hex9c75e

640862 has 4 divisors (see below), whose sum is σ = 961296. Its totient is φ = 320430.

The previous prime is 640859. The next prime is 640873. The reversal of 640862 is 268046.

Subtracting from 640862 its reverse (268046), we obtain a triangular number (372816 = T863).

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160214 + ... + 160217.

It is an arithmetic number, because the mean of its divisors is an integer number (240324).

2640862 is an apocalyptic number.

640862 is a deficient number, since it is larger than the sum of its proper divisors (320434).

640862 is a wasteful number, since it uses less digits than its factorization.

640862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320433.

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

The square root of 640862 is about 800.5385687148. The cubic root of 640862 is about 86.2160603003.

The spelling of 640862 in words is "six hundred forty thousand, eight hundred sixty-two".

Divisors: 1 2 320431 640862