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640158 = 23106693
BaseRepresentation
bin10011100010010011110
31012112010120
42130102132
5130441113
621415410
75304231
oct2342236
91175116
10640158
113a7a62
1226a566
131954bc
14129418
15c9a23
hex9c49e

640158 has 8 divisors (see below), whose sum is σ = 1280328. Its totient is φ = 213384.

The previous prime is 640153. The next prime is 640163. The reversal of 640158 is 851046.

640158 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640153) and next prime (640163).

It is a sphenic number, since it is the product of 3 distinct primes.

640158 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53341 + ... + 53352.

It is an arithmetic number, because the mean of its divisors is an integer number (160041).

2640158 is an apocalyptic number.

640158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640158 is a wasteful number, since it uses less digits than its factorization.

640158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106698.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 640158 is about 800.0987439060. The cubic root of 640158 is about 86.1844786986.

The spelling of 640158 in words is "six hundred forty thousand, one hundred fifty-eight".

Divisors: 1 2 3 6 106693 213386 320079 640158