71780126 has 16 divisors (see below), whose sum is σ = 119676528. Its totient is φ = 32011200.

The previous prime is 71780089. The next prime is 71780131. The reversal of 71780126 is 62108717.

It is a junction number, because it is equal to n+sod(n) for n = 71780092 and 71780101.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 29615 + ... + 31946.

It is an arithmetic number, because the mean of its divisors is an integer number (7479783).

Almost surely, 2^71780126 is an apocalyptic number.

71780126 is a deficient number, since it is larger than the sum of its proper divisors (47896402).

71780126 is a wasteful number, since it uses less digits than its factorization.

71780126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61627.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 71780126 is about 8472.3152679772. The cubic root of 71780126 is about 415.5928547020.

The spelling of 71780126 in words is "seventy-one million, seven hundred eighty thousand, one hundred twenty-six".