78128358 has 64 divisors (see below), whose sum is σ = 195858432. Its totient is φ = 20184480.

The previous prime is 78128341. The next prime is 78128371. The reversal of 78128358 is 85382187.

It is a happy number.

It is a super-2 number, since 2×78128358² = 12208080647552328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 121185 + ... + 121827.

It is an arithmetic number, because the mean of its divisors is an integer number (3060288).

Almost surely, 2^78128358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78128358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97929216).

78128358 is an abundant number, since it is smaller than the sum of its proper divisors (117730074).

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

78128358 is a wasteful number, since it uses less digits than its factorization.

78128358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929.

The product of its digits is 107520, while the sum is 42.

The square root of 78128358 is about 8839.0247199564. The cubic root of 78128358 is about 427.5001114873.

The spelling of 78128358 in words is "seventy-eight million, one hundred twenty-eight thousand, three hundred fifty-eight".