78004445 has 4 divisors (see below), whose sum is σ = 93605340. Its totient is φ = 62403552.

The previous prime is 78004417. The next prime is 78004447. The reversal of 78004445 is 54440087.

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 18852964 + 59151481 = 4342^2 + 7691^2 .

It is a cyclic number.

It is not a de Polignac number, because 78004445 - 2⁸ = 78004189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78004447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7800440 + ... + 7800449.

It is an arithmetic number, because the mean of its divisors is an integer number (23401335).

Almost surely, 2^78004445 is an apocalyptic number.

It is an amenable number.

78004445 is a deficient number, since it is larger than the sum of its proper divisors (15600895).

78004445 is a wasteful number, since it uses less digits than its factorization.

78004445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15600894.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 78004445 is about 8832.0125113136. The cubic root of 78004445 is about 427.2739842412.

The spelling of 78004445 in words is "seventy-eight million, four thousand, four hundred forty-five".