71823661390 has 16 divisors (see below), whose sum is σ = 139227405408. Its totient is φ = 26519505696.

The previous prime is 71823661381. The next prime is 71823661397. The reversal of 71823661390 is 9316632817.

It is a self number, because there is not a number n which added to its sum of digits gives 71823661390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71823661397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276244722 + ... + 276244981.

It is an arithmetic number, because the mean of its divisors is an integer number (8701712838).

Almost surely, 2^71823661390 is an apocalyptic number.

71823661390 is a deficient number, since it is larger than the sum of its proper divisors (67403744018).

71823661390 is a wasteful number, since it uses less digits than its factorization.

71823661390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552489723.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 71823661390 in words is "seventy-one billion, eight hundred twenty-three million, six hundred sixty-one thousand, three hundred ninety".