78378858 has 12 divisors (see below), whose sum is σ = 169820898. Its totient is φ = 26126280.

The previous prime is 78378847. The next prime is 78378869. The reversal of 78378858 is 85887387.

It is an interprime number because it is at equal distance from previous prime (78378847) and next prime (78378869).

It can be written as a sum of positive squares in only one way, i.e., 78375609 + 3249 = 8853^2 + 57^2 .

It is a super-2 number, since 2×78378858² = 12286490762768328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2177173 + ... + 2177208.

Almost surely, 2^78378858 is an apocalyptic number.

78378858 is an abundant number, since it is smaller than the sum of its proper divisors (91442040).

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

78378858 is a wasteful number, since it uses less digits than its factorization.

78378858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354389 (or 4354386 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The square root of 78378858 is about 8853.1834952180. The cubic root of 78378858 is about 427.9565165303.

The spelling of 78378858 in words is "seventy-eight million, three hundred seventy-eight thousand, eight hundred fifty-eight".