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664969 = 4491481
BaseRepresentation
bin10100010010110001001
31020210011111
42202112021
5132234334
622130321
75436454
oct2422611
91223144
10664969
11414668
122809a1
131a3896
1413449b
15d2064
hexa2589

664969 has 4 divisors (see below), whose sum is σ = 666900. Its totient is φ = 663040.

The previous prime is 664967. The next prime is 664973. The reversal of 664969 is 969466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 969466 = 2484733.

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 319225 = 588^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 664969 - 21 = 664967 is a prime.

It is a super-2 number, since 2×6649692 = 884367541922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (664967) 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, 292 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (166725).

2664969 is an apocalyptic number.

It is an amenable number.

664969 is a deficient number, since it is larger than the sum of its proper divisors (1931).

664969 is a wasteful number, since it uses less digits than its factorization.

664969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930.

The product of its digits is 69984, while the sum is 40.

The square root of 664969 is about 815.4563139740. The cubic root of 664969 is about 87.2838310196.

The spelling of 664969 in words is "six hundred sixty-four thousand, nine hundred sixty-nine".

Divisors: 1 449 1481 664969