67712887 has 16 divisors (see below), whose sum is σ = 79041312. Its totient is φ = 57323520.

The previous prime is 67712857. The next prime is 67712929. The reversal of 67712887 is 78821776.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67712887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67712837) 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, 16273 + ... + 20005.

It is an arithmetic number, because the mean of its divisors is an integer number (4940082).

Almost surely, 2^67712887 is an apocalyptic number.

67712887 is a deficient number, since it is larger than the sum of its proper divisors (11328425).

67712887 is a wasteful number, since it uses less digits than its factorization.

67712887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3858.

The product of its digits is 263424, while the sum is 46.

The square root of 67712887 is about 8228.7840535525. The cubic root of 67712887 is about 407.5902408450.

Subtracting 67712887 from its reverse (78821776), we obtain a square (11108889 = 3333²).

The spelling of 67712887 in words is "sixty-seven million, seven hundred twelve thousand, eight hundred eighty-seven".