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68191960 = 2351704799
BaseRepresentation
bin1000001000010…
…00011011011000
311202022111210011
410010020123120
5114424120320
610433331304
71455423244
oct404103330
9152274704
1068191960
11355466a1
121aa06b34
1311187895
1490b1424
155ec005a
hex41086d8

68191960 has 16 divisors (see below), whose sum is σ = 153432000. Its totient is φ = 27276768.

The previous prime is 68191951. The next prime is 68191993. The reversal of 68191960 is 6919186.

68191960 = T6741 + T6742 + T6743.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1704799 = 68191960 / (6 + 8 + 1 + 9 + 1 + 9 + 6 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852360 + ... + 852439.

It is an arithmetic number, because the mean of its divisors is an integer number (9589500).

Almost surely, 268191960 is an apocalyptic number.

68191960 is the 6743-rd centered triangular number.

It is an amenable number.

68191960 is an abundant number, since it is smaller than the sum of its proper divisors (85240040).

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

68191960 is a wasteful number, since it uses less digits than its factorization.

68191960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704810 (or 1704806 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 68191960 is about 8257.8423332006. The cubic root of 68191960 is about 408.5492250916.

The spelling of 68191960 in words is "sixty-eight million, one hundred ninety-one thousand, nine hundred sixty".

Divisors: 1 2 4 5 8 10 20 40 1704799 3409598 6819196 8523995 13638392 17047990 34095980 68191960