78585858 has 48 divisors (see below), whose sum is σ = 184556736. Its totient is φ = 24023520.

The previous prime is 78585847. The next prime is 78585863. The reversal of 78585858 is 85858587.

78585858 is a `hidden beast` number, since 7 + 8 + 58 + 585 + 8 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38073 + ... + 40083.

It is an arithmetic number, because the mean of its divisors is an integer number (3844932).

Almost surely, 2^78585858 is an apocalyptic number.

78585858 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78585858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92278368).

78585858 is an abundant number, since it is smaller than the sum of its proper divisors (105970878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78585858 is a wasteful number, since it uses less digits than its factorization.

78585858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199 (or 2196 counting only the distinct ones).

The product of its digits is 3584000, while the sum is 54.

The square root of 78585858 is about 8864.8664964567. The cubic root of 78585858 is about 428.3329323512.

The spelling of 78585858 in words is "seventy-eight million, five hundred eighty-five thousand, eight hundred fifty-eight".