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68138547 = 395323833
BaseRepresentation
bin1000000111110…
…11011000110011
311202012210111220
410003323120303
5114420413142
610432240123
71455111441
oct403733063
9152183456
1068138547
113550a554
121a9a0043
1311169489
149099b91
155eae2ec
hex40fb633

68138547 has 8 divisors (see below), whose sum is σ = 90950544. Its totient is φ = 45376128.

The previous prime is 68138509. The next prime is 68138561. The reversal of 68138547 is 74583186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68138547 - 219 = 67614259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68138499 and 68138508.

It is not an unprimeable number, because it can be changed into a prime (68138347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9058 + ... + 14775.

It is an arithmetic number, because the mean of its divisors is an integer number (11368818).

Almost surely, 268138547 is an apocalyptic number.

68138547 is a deficient number, since it is larger than the sum of its proper divisors (22811997).

68138547 is a wasteful number, since it uses less digits than its factorization.

68138547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24789.

The product of its digits is 161280, while the sum is 42.

The square root of 68138547 is about 8254.6076224131. The cubic root of 68138547 is about 408.4425285458.

The spelling of 68138547 in words is "sixty-eight million, one hundred thirty-eight thousand, five hundred forty-seven".

Divisors: 1 3 953 2859 23833 71499 22712849 68138547