68840409 has 12 divisors (see below), whose sum is σ = 100890608. Its totient is φ = 41721240.

The previous prime is 68840407. The next prime is 68840417. The reversal of 68840409 is 90404886.

It is not a de Polignac number, because 68840409 - 2¹ = 68840407 is a prime.

It is a super-2 number, since 2×68840409² = 9478003822574562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68840407) 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, 94459 + ... + 95184.

Almost surely, 2^68840409 is an apocalyptic number.

It is an amenable number.

68840409 is a deficient number, since it is larger than the sum of its proper divisors (32050199).

68840409 is a wasteful number, since it uses less digits than its factorization.

68840409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189668 (or 189657 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 68840409 is about 8297.0120525404. The cubic root of 68840409 is about 409.8401300163.

The spelling of 68840409 in words is "sixty-eight million, eight hundred forty thousand, four hundred nine".