78140566 has 8 divisors (see below), whose sum is σ = 133955280. Its totient is φ = 33488808.

The previous prime is 78140549. The next prime is 78140609. The reversal of 78140566 is 66504187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78140566² = 12211896109600712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2790721 + ... + 2790748.

It is an arithmetic number, because the mean of its divisors is an integer number (16744410).

Almost surely, 2^78140566 is an apocalyptic number.

78140566 is a deficient number, since it is larger than the sum of its proper divisors (55814714).

78140566 is a wasteful number, since it uses less digits than its factorization.

78140566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5581478.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 78140566 is about 8839.7152669076. The cubic root of 78140566 is about 427.5223767684.

The spelling of 78140566 in words is "seventy-eight million, one hundred forty thousand, five hundred sixty-six".