78641459 has 4 divisors (see below), whose sum is σ = 84690816. Its totient is φ = 72592104.

The previous prime is 78641449. The next prime is 78641477. The reversal of 78641459 is 95414687.

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

It is not a de Polignac number, because 78641459 - 2¹⁶ = 78575923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78641449) 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, 3024659 + ... + 3024684.

It is an arithmetic number, because the mean of its divisors is an integer number (21172704).

Almost surely, 2^78641459 is an apocalyptic number.

78641459 is a deficient number, since it is larger than the sum of its proper divisors (6049357).

78641459 is a wasteful number, since it uses less digits than its factorization.

78641459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049356.

The product of its digits is 241920, while the sum is 44.

The square root of 78641459 is about 8868.0019733872. The cubic root of 78641459 is about 428.4339264549.

The spelling of 78641459 in words is "seventy-eight million, six hundred forty-one thousand, four hundred fifty-nine".