78505941 has 4 divisors (see below), whose sum is σ = 104674592. Its totient is φ = 52337292.

The previous prime is 78505937. The next prime is 78505943. The reversal of 78505941 is 14950587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78505941 - 2² = 78505937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78505941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78505943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13084321 + ... + 13084326.

It is an arithmetic number, because the mean of its divisors is an integer number (26168648).

Almost surely, 2^78505941 is an apocalyptic number.

It is an amenable number.

78505941 is a deficient number, since it is larger than the sum of its proper divisors (26168651).

78505941 is a wasteful number, since it uses less digits than its factorization.

78505941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26168650.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 78505941 is about 8860.3578370176. The cubic root of 78505941 is about 428.1876869936.

The spelling of 78505941 in words is "seventy-eight million, five hundred five thousand, nine hundred forty-one".