78161289 has 8 divisors (see below), whose sum is σ = 104264160. Its totient is φ = 52082976.

The previous prime is 78161287. The next prime is 78161297. The reversal of 78161289 is 98216187.

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

It is not a de Polignac number, because 78161289 - 2¹ = 78161287 is a prime.

It is a super-2 number, since 2×78161289² = 12218374196283042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78161289.

It is not an unprimeable number, because it can be changed into a prime (78161287) 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 7 ways as a sum of consecutive naturals, for example, 3414 + ... + 12960.

It is an arithmetic number, because the mean of its divisors is an integer number (13033020).

Almost surely, 2^78161289 is an apocalyptic number.

It is an amenable number.

78161289 is a deficient number, since it is larger than the sum of its proper divisors (26102871).

78161289 is a wasteful number, since it uses less digits than its factorization.

78161289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12279.

The product of its digits is 48384, while the sum is 42.

The square root of 78161289 is about 8840.8873423430. The cubic root of 78161289 is about 427.5601666283.

The spelling of 78161289 in words is "seventy-eight million, one hundred sixty-one thousand, two hundred eighty-nine".