78366386 has 12 divisors (see below), whose sum is σ = 136741518. Its totient is φ = 33585552.

The previous prime is 78366377. The next prime is 78366443. The reversal of 78366386 is 68366387.

It can be written as a sum of positive squares in only one way, i.e., 45819361 + 32547025 = 6769^2 + 5705^2 .

It is a super-2 number, since 2×78366386² = 12282580909401992, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78366386.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399731 + ... + 399926.

Almost surely, 2^78366386 is an apocalyptic number.

78366386 is a deficient number, since it is larger than the sum of its proper divisors (58375132).

78366386 is a wasteful number, since it uses less digits than its factorization.

78366386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799673 (or 799666 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The square root of 78366386 is about 8852.4790878036. The cubic root of 78366386 is about 427.9338158644.

Subtracting from 78366386 its reverse (68366387), we obtain a palindrome (9999999).

The spelling of 78366386 in words is "seventy-eight million, three hundred sixty-six thousand, three hundred eighty-six".