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661944 = 23327581
BaseRepresentation
bin10100001100110111000
31020122000110
42201212320
5132140234
622104320
75424603
oct2414670
91218013
10661944
11412368
1227b0a0
131a23aa
1413333a
15d11e9
hexa19b8

661944 has 16 divisors (see below), whose sum is σ = 1654920. Its totient is φ = 220640.

The previous prime is 661939. The next prime is 661949. The reversal of 661944 is 449166.

It is an interprime number because it is at equal distance from previous prime (661939) and next prime (661949).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661949) by changing a digit.

661944 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13767 + ... + 13814.

2661944 is an apocalyptic number.

It is an amenable number.

661944 is an abundant number, since it is smaller than the sum of its proper divisors (992976).

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

661944 is a wasteful number, since it uses less digits than its factorization.

661944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27590 (or 27586 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 661944 is about 813.5994100293. The cubic root of 661944 is about 87.1512759811.

The spelling of 661944 in words is "six hundred sixty-one thousand, nine hundred forty-four".

Divisors: 1 2 3 4 6 8 12 24 27581 55162 82743 110324 165486 220648 330972 661944