68840547 has 4 divisors (see below), whose sum is σ = 91787400. Its totient is φ = 45893696.

The previous prime is 68840539. The next prime is 68840561. The reversal of 68840547 is 74504886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68840547 - 2³ = 68840539 is a prime.

It is a super-2 number, since 2×68840547² = 9478041822518418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68840499 and 68840508.

It is not an unprimeable number, because it can be changed into a prime (68840537) 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, 11473422 + ... + 11473427.

It is an arithmetic number, because the mean of its divisors is an integer number (22946850).

Almost surely, 2^68840547 is an apocalyptic number.

68840547 is a deficient number, since it is larger than the sum of its proper divisors (22946853).

68840547 is a wasteful number, since it uses less digits than its factorization.

68840547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22946852.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 68840547 is about 8297.0203687830. The cubic root of 68840547 is about 409.8404038763.

The spelling of 68840547 in words is "sixty-eight million, eight hundred forty thousand, five hundred forty-seven".