78505245 has 96 divisors (see below), whose sum is σ = 176467200. Its totient is φ = 31352832.

The previous prime is 78505211. The next prime is 78505249. The reversal of 78505245 is 54250587.

It is a happy number.

It is not a de Polignac number, because 78505245 - 2¹⁹ = 77980957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78505249) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 77301 + ... + 78309.

It is an arithmetic number, because the mean of its divisors is an integer number (1838200).

Almost surely, 2^78505245 is an apocalyptic number.

It is an amenable number.

78505245 is an abundant number, since it is smaller than the sum of its proper divisors (97961955).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78505245 is a wasteful number, since it uses less digits than its factorization.

78505245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059 (or 1056 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 78505245 is about 8860.3185608645. The cubic root of 78505245 is about 428.1864216137.

The spelling of 78505245 in words is "seventy-eight million, five hundred five thousand, two hundred forty-five".