81203706 has 24 divisors (see below), whose sum is σ = 178925760. Its totient is φ = 26608776.

The previous prime is 81203677. The next prime is 81203711. The reversal of 81203706 is 60730218.

It is a self number, because there is not a number n which added to its sum of digits gives 81203706.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37170 + ... + 39293.

It is an arithmetic number, because the mean of its divisors is an integer number (7455240).

Almost surely, 2^81203706 is an apocalyptic number.

81203706 is an abundant number, since it is smaller than the sum of its proper divisors (97722054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81203706 is a wasteful number, since it uses less digits than its factorization.

81203706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76530 (or 76527 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 81203706 is about 9011.3098936836. The cubic root of 81203706 is about 433.0372772000.

The spelling of 81203706 in words is "eighty-one million, two hundred three thousand, seven hundred six".