78369545 has 4 divisors (see below), whose sum is σ = 94043460. Its totient is φ = 62695632.

The previous prime is 78369527. The next prime is 78369553. The reversal of 78369545 is 54596387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34703881 + 43665664 = 5891^2 + 6608^2 .

It is a cyclic number.

It is not a de Polignac number, because 78369545 - 2¹² = 78365449 is a prime.

It is a super-2 number, since 2×78369545² = 12283571167014050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78369545.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7836950 + ... + 7836959.

It is an arithmetic number, because the mean of its divisors is an integer number (23510865).

Almost surely, 2^78369545 is an apocalyptic number.

It is an amenable number.

78369545 is a deficient number, since it is larger than the sum of its proper divisors (15673915).

78369545 is a wasteful number, since it uses less digits than its factorization.

78369545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15673914.

The product of its digits is 907200, while the sum is 47.

The square root of 78369545 is about 8852.6575106010. The cubic root of 78369545 is about 427.9395658840.

The spelling of 78369545 in words is "seventy-eight million, three hundred sixty-nine thousand, five hundred forty-five".