78355386 has 24 divisors (see below), whose sum is σ = 170270100. Its totient is φ = 26041536.

The previous prime is 78355349. The next prime is 78355391. The reversal of 78355386 is 68355387.

It can be written as a sum of positive squares in 2 ways, for example, as 74494161 + 3861225 = 8631^2 + 1965^2 .

It is a super-2 number, since 2×78355386² = 12279133030417992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46 + ... + 12518.

Almost surely, 2^78355386 is an apocalyptic number.

78355386 is an abundant number, since it is smaller than the sum of its proper divisors (91914714).

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

78355386 is a wasteful number, since it uses less digits than its factorization.

78355386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12830 (or 12827 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 78355386 is about 8851.8577711122. The cubic root of 78355386 is about 427.9137924314.

Subtracting from 78355386 its reverse (68355387), we obtain a palindrome (9999999).

It can be divided in two parts, 783 and 55386, that added together give a square (56169 = 237²).

The spelling of 78355386 in words is "seventy-eight million, three hundred fifty-five thousand, three hundred eighty-six".