68140647 has 24 divisors (see below), whose sum is σ = 102997440. Its totient is φ = 43365120.

The previous prime is 68140637. The next prime is 68140661. The reversal of 68140647 is 74604186.

68140647 is a `hidden beast` number, since 6 + 8 + 1 + 4 + 0 + 647 = 666.

It is not a de Polignac number, because 68140647 - 2¹⁹ = 67616359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68140637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15379 + ... + 19307.

It is an arithmetic number, because the mean of its divisors is an integer number (4291560).

Almost surely, 2^68140647 is an apocalyptic number.

68140647 is a deficient number, since it is larger than the sum of its proper divisors (34856793).

68140647 is a wasteful number, since it uses less digits than its factorization.

68140647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023 (or 4020 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 68140647 is about 8254.7348231182. The cubic root of 68140647 is about 408.4467245090.

It can be divided in two parts, 681 and 40647, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 68140647 in words is "sixty-eight million, one hundred forty thousand, six hundred forty-seven".