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69440 = 265731
BaseRepresentation
bin10000111101000000
310112020212
4100331000
54210230
61253252
7406310
oct207500
9115225
1069440
1148198
1234228
13257b7
141b440
1515895
hex10f40

69440 has 56 divisors (see below), whose sum is σ = 195072. Its totient is φ = 23040.

The previous prime is 69439. The next prime is 69457. The reversal of 69440 is 4496.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2225 + ... + 2255.

269440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97536).

69440 is an abundant number, since it is smaller than the sum of its proper divisors (125632).

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

69440 is a wasteful number, since it uses less digits than its factorization.

69440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 69440 is about 263.5147054720. The cubic root of 69440 is about 41.1026576781.

The spelling of 69440 in words is "sixty-nine thousand, four hundred forty".