71428197979 has 4 divisors (see below), whose sum is σ = 75187576840. Its totient is φ = 67668819120.

The previous prime is 71428197949. The next prime is 71428197983. The reversal of 71428197979 is 97979182417.

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

It is a cyclic number.

It is not a de Polignac number, because 71428197979 - 2¹⁷ = 71428066907 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 71428197979.

It is not an unprimeable number, because it can be changed into a prime (71428197949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1879689402 + ... + 1879689439.

It is an arithmetic number, because the mean of its divisors is an integer number (18796894210).

Almost surely, 2^71428197979 is an apocalyptic number.

71428197979 is a deficient number, since it is larger than the sum of its proper divisors (3759378861).

71428197979 is a wasteful number, since it uses less digits than its factorization.

71428197979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759378860.

The product of its digits is 16003008, while the sum is 64.

The spelling of 71428197979 in words is "seventy-one billion, four hundred twenty-eight million, one hundred ninety-seven thousand, nine hundred seventy-nine".