78623858 has 8 divisors (see below), whose sum is σ = 118375020. Its totient is φ = 39165520.

The previous prime is 78623849. The next prime is 78623863. The reversal of 78623858 is 85832687.

It can be written as a sum of positive squares in 2 ways, for example, as 78623689 + 169 = 8867^2 + 13^2 .

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

It is a super-2 number, since 2×78623858² = 12363422093608328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72533 + ... + 73608.

Almost surely, 2^78623858 is an apocalyptic number.

78623858 is a deficient number, since it is larger than the sum of its proper divisors (39751162).

78623858 is a wasteful number, since it uses less digits than its factorization.

78623858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146412.

The product of its digits is 645120, while the sum is 47.

The square root of 78623858 is about 8867.0095297118. The cubic root of 78623858 is about 428.4019610078.

The spelling of 78623858 in words is "seventy-eight million, six hundred twenty-three thousand, eight hundred fifty-eight".