68857645 has 8 divisors (see below), whose sum is σ = 82924920. Its totient is φ = 54888960.

The previous prime is 68857643. The next prime is 68857651. The reversal of 68857645 is 54675886.

It can be written as a sum of positive squares in 4 ways, for example, as 116964 + 68740681 = 342^2 + 8291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68857645 - 2¹ = 68857643 is a prime.

It is a super-3 number, since 3×68857645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68857643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23100 + ... + 25909.

It is an arithmetic number, because the mean of its divisors is an integer number (10365615).

Almost surely, 2^68857645 is an apocalyptic number.

It is an amenable number.

68857645 is a deficient number, since it is larger than the sum of its proper divisors (14067275).

68857645 is a wasteful number, since it uses less digits than its factorization.

68857645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49295.

The product of its digits is 1612800, while the sum is 49.

The square root of 68857645 is about 8298.0506747067. The cubic root of 68857645 is about 409.8743319001.

The spelling of 68857645 in words is "sixty-eight million, eight hundred fifty-seven thousand, six hundred forty-five".