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640465 = 5729631
BaseRepresentation
bin10011100010111010001
31012112112221
42130113101
5130443330
621421041
75305150
oct2342721
91175487
10640465
113a8211
1226a781
13195697
14129597
15c9b7a
hex9c5d1

640465 has 16 divisors (see below), whose sum is σ = 910080. Its totient is φ = 423360.

The previous prime is 640463. The next prime is 640477. The reversal of 640465 is 564046.

It is a happy number.

640465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640465 - 21 = 640463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640463) 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, 700 + ... + 1330.

It is an arithmetic number, because the mean of its divisors is an integer number (56880).

2640465 is an apocalyptic number.

It is an amenable number.

640465 is a deficient number, since it is larger than the sum of its proper divisors (269615).

640465 is a wasteful number, since it uses less digits than its factorization.

640465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 640465 is about 800.2905722299. The cubic root of 640465 is about 86.1982536347.

The spelling of 640465 in words is "six hundred forty thousand, four hundred sixty-five".

Divisors: 1 5 7 29 35 145 203 631 1015 3155 4417 18299 22085 91495 128093 640465