78885145 has 8 divisors (see below), whose sum is σ = 94719240. Its totient is φ = 63070080.

The previous prime is 78885143. The next prime is 78885167. The reversal of 78885145 is 54158887.

It can be written as a sum of positive squares in 4 ways, for example, as 45198729 + 33686416 = 6723^2 + 5804^2 .

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

It is not a de Polignac number, because 78885145 - 2¹ = 78885143 is a prime.

It is a super-2 number, since 2×78885145² = 12445732203342050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78885095 and 78885104.

It is not an unprimeable number, because it can be changed into a prime (78885143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7021 + ... + 14389.

It is an arithmetic number, because the mean of its divisors is an integer number (11839905).

Almost surely, 2^78885145 is an apocalyptic number.

It is an amenable number.

78885145 is a deficient number, since it is larger than the sum of its proper divisors (15834095).

78885145 is a wasteful number, since it uses less digits than its factorization.

78885145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9515.

The product of its digits is 358400, while the sum is 46.

The square root of 78885145 is about 8881.7309686795. The cubic root of 78885145 is about 428.8759990304.

The spelling of 78885145 in words is "seventy-eight million, eight hundred eighty-five thousand, one hundred forty-five".