68972409 has 12 divisors (see below), whose sum is σ = 108683952. Its totient is φ = 41801400.

The previous prime is 68972399. The next prime is 68972429. The reversal of 68972409 is 90427986.

It is a happy number.

It is not a de Polignac number, because 68972409 - 2⁸ = 68972153 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68972429) 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, 348247 + ... + 348444.

It is an arithmetic number, because the mean of its divisors is an integer number (9056996).

Almost surely, 2^68972409 is an apocalyptic number.

It is an amenable number.

68972409 is a deficient number, since it is larger than the sum of its proper divisors (39711543).

68972409 is a wasteful number, since it uses less digits than its factorization.

68972409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696708 (or 696705 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 68972409 is about 8304.9629138245. The cubic root of 68972409 is about 410.1019159689.

The spelling of 68972409 in words is "sixty-eight million, nine hundred seventy-two thousand, four hundred nine".