71978559 has 32 divisors (see below), whose sum is σ = 102359040. Its totient is φ = 44928000.

The previous prime is 71978549. The next prime is 71978587. The reversal of 71978559 is 95587917.

It is not a de Polignac number, because 71978559 - 2¹⁷ = 71847487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71978539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 712609 + ... + 712709.

It is an arithmetic number, because the mean of its divisors is an integer number (3198720).

Almost surely, 2^71978559 is an apocalyptic number.

71978559 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

71978559 is a deficient number, since it is larger than the sum of its proper divisors (30380481).

71978559 is a wasteful number, since it uses less digits than its factorization.

71978559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its digits is 793800, while the sum is 51.

The square root of 71978559 is about 8484.0178571241. The cubic root of 71978559 is about 415.9754650687.

The spelling of 71978559 in words is "seventy-one million, nine hundred seventy-eight thousand, five hundred fifty-nine".