78366026 has 4 divisors (see below), whose sum is σ = 117549042. Its totient is φ = 39183012.

The previous prime is 78366023. The next prime is 78366031. The reversal of 78366026 is 62066387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 40972801 + 37393225 = 6401^2 + 6115^2 .

It is a super-2 number, since 2×78366026² = 12282468062065352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78366023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19591505 + ... + 19591508.

Almost surely, 2^78366026 is an apocalyptic number.

78366026 is a deficient number, since it is larger than the sum of its proper divisors (39183016).

78366026 is a wasteful number, since it uses less digits than its factorization.

78366026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39183015.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 78366026 is about 8852.4587544930. The cubic root of 78366026 is about 427.9331605817.

The spelling of 78366026 in words is "seventy-eight million, three hundred sixty-six thousand, twenty-six".