68891487 has 16 divisors (see below), whose sum is σ = 106417920. Its totient is φ = 38826432.

The previous prime is 68891453. The next prime is 68891489. The reversal of 68891487 is 78419886.

It is not a de Polignac number, because 68891487 - 2⁶ = 68891423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68891489) 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, 20937 + ... + 24002.

It is an arithmetic number, because the mean of its divisors is an integer number (6651120).

Almost surely, 2^68891487 is an apocalyptic number.

68891487 is a deficient number, since it is larger than the sum of its proper divisors (37526433).

68891487 is a wasteful number, since it uses less digits than its factorization.

68891487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45022.

The product of its digits is 774144, while the sum is 51.

The square root of 68891487 is about 8300.0895778299. The cubic root of 68891487 is about 409.9414689398.

It can be divided in two parts, 68891 and 487, that added together give a triangular number (69378 = T₃₇₂).

The spelling of 68891487 in words is "sixty-eight million, eight hundred ninety-one thousand, four hundred eighty-seven".