68155785 has 24 divisors (see below), whose sum is σ = 123274944. Its totient is φ = 34768800.

The previous prime is 68155783. The next prime is 68155799. The reversal of 68155785 is 58755186.

68155785 is a `hidden beast` number, since 68 + 15 + 578 + 5 = 666.

It is not a de Polignac number, because 68155785 - 2¹ = 68155783 is a prime.

It is a super-2 number, since 2×68155785² = 9290422057932450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 68155785.

It is not an unprimeable number, because it can be changed into a prime (68155783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31891 + ... + 33960.

It is an arithmetic number, because the mean of its divisors is an integer number (5136456).

Almost surely, 2^68155785 is an apocalyptic number.

It is an amenable number.

68155785 is a deficient number, since it is larger than the sum of its proper divisors (55119159).

68155785 is a wasteful number, since it uses less digits than its factorization.

68155785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65885 (or 65882 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 68155785 is about 8255.6517005019. The cubic root of 68155785 is about 408.4769688588.

The spelling of 68155785 in words is "sixty-eight million, one hundred fifty-five thousand, seven hundred eighty-five".