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67685520 = 2435740289
BaseRepresentation
bin1000000100011…
…00110010010000
311201100210002010
410002030302100
5114311414040
610414422520
71451213610
oct402146220
9151323063
1067685520
1135230151
121a801a40
131103b206
148dbca40
155e1ee80
hex408cc90

67685520 has 80 divisors (see below), whose sum is σ = 239806080. Its totient is φ = 15470592.

The previous prime is 67685509. The next prime is 67685521. The reversal of 67685520 is 2558676.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (67685521) 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, 18465 + ... + 21824.

It is an arithmetic number, because the mean of its divisors is an integer number (2997576).

Almost surely, 267685520 is an apocalyptic number.

67685520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67685520 is an abundant number, since it is smaller than the sum of its proper divisors (172120560).

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

67685520 is a wasteful number, since it uses less digits than its factorization.

67685520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40312 (or 40306 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 67685520 is about 8227.1210031213. The cubic root of 67685520 is about 407.5353225682.

The spelling of 67685520 in words is "sixty-seven million, six hundred eighty-five thousand, five hundred twenty".