81984610 has 16 divisors (see below), whose sum is σ = 149992632. Its totient is φ = 32256000.

The previous prime is 81984589. The next prime is 81984611. The reversal of 81984610 is 1648918.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46498761 + 35485849 = 6819^2 + 5957^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81984610.

It is not an unprimeable number, because it can be changed into a prime (81984611) 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, 66591 + ... + 67810.

Almost surely, 2^81984610 is an apocalyptic number.

81984610 is a deficient number, since it is larger than the sum of its proper divisors (68008022).

81984610 is a wasteful number, since it uses less digits than its factorization.

81984610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134469.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 81984610 is about 9054.5353276687. The cubic root of 81984610 is about 434.4209673763.

The spelling of 81984610 in words is "eighty-one million, nine hundred eighty-four thousand, six hundred ten".