71782864 has 10 divisors (see below), whose sum is σ = 139079330. Its totient is φ = 35891424.

The previous prime is 71782811. The next prime is 71782877. The reversal of 71782864 is 46828717.

It can be written as a sum of positive squares in only one way, i.e., 60840000 + 10942864 = 7800^2 + 3308^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71782864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2243199 + ... + 2243230.

It is an arithmetic number, because the mean of its divisors is an integer number (13907933).

Almost surely, 2^71782864 is an apocalyptic number.

It is an amenable number.

71782864 is a deficient number, since it is larger than the sum of its proper divisors (67296466).

71782864 is a wasteful number, since it uses less digits than its factorization.

71782864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486437 (or 4486431 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 71782864 is about 8472.4768515470. The cubic root of 71782864 is about 415.5981387958.

It can be divided in two parts, 7 and 1782864, that added together give a palindrome (1782871).

The spelling of 71782864 in words is "seventy-one million, seven hundred eighty-two thousand, eight hundred sixty-four".