68991473 has 4 divisors (see below), whose sum is σ = 70160880. Its totient is φ = 67822068.

The previous prime is 68991449. The next prime is 68991521. The reversal of 68991473 is 37419986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37419986 = 2 ⋅18709993.

It is a cyclic number.

It is not a de Polignac number, because 68991473 - 2¹⁶ = 68925937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68991073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584615 + ... + 584732.

It is an arithmetic number, because the mean of its divisors is an integer number (17540220).

Almost surely, 2^68991473 is an apocalyptic number.

It is an amenable number.

68991473 is a deficient number, since it is larger than the sum of its proper divisors (1169407).

68991473 is a wasteful number, since it uses less digits than its factorization.

68991473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169406.

The product of its digits is 326592, while the sum is 47.

The square root of 68991473 is about 8306.1105819752. The cubic root of 68991473 is about 410.1396965966.

The spelling of 68991473 in words is "sixty-eight million, nine hundred ninety-one thousand, four hundred seventy-three".