78341666 has 16 divisors (see below), whose sum is σ = 127290744. Its totient is φ = 35946624.

The previous prime is 78341663. The next prime is 78341671. The reversal of 78341666 is 66614387.

It can be written as a sum of positive squares in 4 ways, for example, as 77880625 + 461041 = 8825^2 + 679^2 .

It is a super-2 number, since 2×78341666² = 12274833263311112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78341663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4211 + ... + 13206.

Almost surely, 2^78341666 is an apocalyptic number.

78341666 is a deficient number, since it is larger than the sum of its proper divisors (48949078).

78341666 is a wasteful number, since it uses less digits than its factorization.

78341666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17605.

The product of its digits is 145152, while the sum is 41.

The square root of 78341666 is about 8851.0827586234. The cubic root of 78341666 is about 427.8888151230. Note that the first 4 decimals are identical.

The spelling of 78341666 in words is "seventy-eight million, three hundred forty-one thousand, six hundred sixty-six".