67816989 has 12 divisors (see below), whose sum is σ = 98034300. Its totient is φ = 45176064.

The previous prime is 67816979. The next prime is 67817003. The reversal of 67816989 is 98961876.

It can be written as a sum of positive squares in 2 ways, for example, as 32319225 + 35497764 = 5685^2 + 5958^2 .

It is not a de Polignac number, because 67816989 - 2²³ = 59428381 is a prime.

It is a super-2 number, since 2×67816989² = 9198287994052242, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67816939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15007 + ... + 18995.

It is an arithmetic number, because the mean of its divisors is an integer number (8169525).

Almost surely, 2^67816989 is an apocalyptic number.

It is an amenable number.

67816989 is a deficient number, since it is larger than the sum of its proper divisors (30217311).

67816989 is a wasteful number, since it uses less digits than its factorization.

67816989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5884 (or 5881 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 67816989 is about 8235.1071031287. The cubic root of 67816989 is about 407.7990107222.

The spelling of 67816989 in words is "sixty-seven million, eight hundred sixteen thousand, nine hundred eighty-nine".