78448591 has 8 divisors (see below), whose sum is σ = 89452944. Its totient is φ = 68154240.

The previous prime is 78448589. The next prime is 78448613. The reversal of 78448591 is 19584487.

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

It is a cyclic number.

It is not a de Polignac number, because 78448591 - 2¹ = 78448589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78448571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177265 + ... + 177706.

It is an arithmetic number, because the mean of its divisors is an integer number (11181618).

Almost surely, 2^78448591 is an apocalyptic number.

78448591 is a deficient number, since it is larger than the sum of its proper divisors (11004353).

78448591 is a wasteful number, since it uses less digits than its factorization.

78448591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355001.

The product of its digits is 322560, while the sum is 46.

The square root of 78448591 is about 8857.1209204797. The cubic root of 78448591 is about 428.0833953283.

The spelling of 78448591 in words is "seventy-eight million, four hundred forty-eight thousand, five hundred ninety-one".