78169385 has 16 divisors (see below), whose sum is σ = 108210816. Its totient is φ = 53098368.

The previous prime is 78169373. The next prime is 78169391. The reversal of 78169385 is 58396187.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78169385 - 2¹² = 78165289 is a prime.

It is a super-2 number, since 2×78169385² = 12220905502556450, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 6692 + ... + 14181.

It is an arithmetic number, because the mean of its divisors is an integer number (6763176).

Almost surely, 2^78169385 is an apocalyptic number.

It is an amenable number.

78169385 is a deficient number, since it is larger than the sum of its proper divisors (30041431).

78169385 is a wasteful number, since it uses less digits than its factorization.

78169385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20992.

The product of its digits is 362880, while the sum is 47.

The square root of 78169385 is about 8841.3452030785. The cubic root of 78169385 is about 427.5749284439.

The spelling of 78169385 in words is "seventy-eight million, one hundred sixty-nine thousand, three hundred eighty-five".