78166408 has 24 divisors (see below), whose sum is σ = 155695050. Its totient is φ = 36783104.

The previous prime is 78166381. The next prime is 78166409. The reversal of 78166408 is 80466187.

It can be written as a sum of positive squares in 3 ways, for example, as 77827684 + 338724 = 8822^2 + 582^2 .

It is a super-2 number, since 2×78166408² = 12219974679244928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78166409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14593 + ... + 19216.

Almost surely, 2^78166408 is an apocalyptic number.

It is an amenable number.

78166408 is a deficient number, since it is larger than the sum of its proper divisors (77528642).

78166408 is a wasteful number, since it uses less digits than its factorization.

78166408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33849 (or 33828 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78166408 is about 8841.1768447419. The cubic root of 78166408 is about 427.5695004590.

The spelling of 78166408 in words is "seventy-eight million, one hundred sixty-six thousand, four hundred eight".