71628979 has 2 divisors, whose sum is σ = 71628980. Its totient is φ = 71628978.

The previous prime is 71628967. The next prime is 71629001. The reversal of 71628979 is 97982617.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71628979 - 2⁹ = 71628467 is a prime.

It is not a weakly prime, because it can be changed into another prime (71628079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35814489 + 35814490.

It is an arithmetic number, because the mean of its divisors is an integer number (35814490).

Almost surely, 2^71628979 is an apocalyptic number.

71628979 is a deficient number, since it is larger than the sum of its proper divisors (1).

71628979 is an equidigital number, since it uses as much as digits as its factorization.

71628979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 71628979 is about 8463.3905144451. The cubic root of 71628979 is about 415.3009458848.

The spelling of 71628979 in words is "seventy-one million, six hundred twenty-eight thousand, nine hundred seventy-nine".