78785858 has 16 divisors (see below), whose sum is σ = 119883456. Its totient is φ = 38828400.

The previous prime is 78785851. The next prime is 78785867. The reversal of 78785858 is 85858787.

It is a happy number.

It is a super-2 number, since 2×78785858² = 12414422841592328, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78785851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52385 + ... + 53867.

It is an arithmetic number, because the mean of its divisors is an integer number (7492716).

Almost surely, 2^78785858 is an apocalyptic number.

78785858 is a deficient number, since it is larger than the sum of its proper divisors (41097598).

78785858 is a wasteful number, since it uses less digits than its factorization.

78785858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849.

The product of its digits is 5017600, while the sum is 56.

The square root of 78785858 is about 8876.1398141309. The cubic root of 78785858 is about 428.6959918031.

The spelling of 78785858 in words is "seventy-eight million, seven hundred eighty-five thousand, eight hundred fifty-eight".