78641959 has 8 divisors (see below), whose sum is σ = 86054400. Its totient is φ = 71273400.

The previous prime is 78641957. The next prime is 78641963. The reversal of 78641959 is 95914687.

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

It is not a de Polignac number, because 78641959 - 2¹ = 78641957 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 (78641957) 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, 7159 + ... + 14440.

It is an arithmetic number, because the mean of its divisors is an integer number (10756800).

Almost surely, 2^78641959 is an apocalyptic number.

78641959 is a deficient number, since it is larger than the sum of its proper divisors (7412441).

78641959 is a wasteful number, since it uses less digits than its factorization.

78641959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21941.

The product of its digits is 544320, while the sum is 49.

The square root of 78641959 is about 8868.0301645856. The cubic root of 78641959 is about 428.4348344429.

The spelling of 78641959 in words is "seventy-eight million, six hundred forty-one thousand, nine hundred fifty-nine".