78136866 has 32 divisors (see below), whose sum is σ = 174285120. Its totient is φ = 25948512.

The previous prime is 78136847. The next prime is 78136867. The reversal of 78136866 is 66863187.

It is a super-2 number, since 2×78136866² = 12210739656603912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78136867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12726 + ... + 17838.

It is an arithmetic number, because the mean of its divisors is an integer number (5446410).

Almost surely, 2^78136866 is an apocalyptic number.

78136866 is an abundant number, since it is smaller than the sum of its proper divisors (96148254).

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

78136866 is a wasteful number, since it uses less digits than its factorization.

78136866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407 (or 5401 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 78136866 is about 8839.5059816711. The cubic root of 78136866 is about 427.5156288531.

The spelling of 78136866 in words is "seventy-eight million, one hundred thirty-six thousand, eight hundred sixty-six".