68987511 has 16 divisors (see below), whose sum is σ = 106648320. Its totient is φ = 43991640.

The previous prime is 68987509. The next prime is 68987519. The reversal of 68987511 is 11578986.

It is not a de Polignac number, because 68987511 - 2¹ = 68987509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68987519) 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, 54925 + ... + 56166.

It is an arithmetic number, because the mean of its divisors is an integer number (6665520).

Almost surely, 2^68987511 is an apocalyptic number.

68987511 is a deficient number, since it is larger than the sum of its proper divisors (37660809).

68987511 is a wasteful number, since it uses less digits than its factorization.

68987511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111123 (or 111117 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 68987511 is about 8305.8720794387. The cubic root of 68987511 is about 410.1318453626.

The spelling of 68987511 in words is "sixty-eight million, nine hundred eighty-seven thousand, five hundred eleven".