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67720317 = 376748131
BaseRepresentation
bin1000000100101…
…01010001111101
311201102112210220
410002111101331
5114314022232
610415251553
71451420220
oct402252175
9151375726
1067720317
1135254305
121a819bb9
1311050cc2
148dcb5b7
155e2a42c
hex409547d

67720317 has 16 divisors (see below), whose sum is σ = 104735232. Its totient is φ = 38118960.

The previous prime is 67720243. The next prime is 67720321. The reversal of 67720317 is 71302776.

It is not a de Polignac number, because 67720317 - 212 = 67716221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67720217) 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, 22659 + ... + 25472.

It is an arithmetic number, because the mean of its divisors is an integer number (6545952).

Almost surely, 267720317 is an apocalyptic number.

67720317 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

67720317 is a deficient number, since it is larger than the sum of its proper divisors (37014915).

67720317 is a wasteful number, since it uses less digits than its factorization.

67720317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48208.

The product of its (nonzero) digits is 12348, while the sum is 33.

The square root of 67720317 is about 8229.2355051973. The cubic root of 67720317 is about 407.6051483211.

The spelling of 67720317 in words is "sixty-seven million, seven hundred twenty thousand, three hundred seventeen".