81698632 has 24 divisors (see below), whose sum is σ = 161677350. Its totient is φ = 38697984.

The previous prime is 81698611. The next prime is 81698663. The reversal of 81698632 is 23689618.

It can be written as a sum of positive squares in only one way, i.e., 50495236 + 31203396 = 7106^2 + 5586^2 .

It is a super-3 number, since 3×81698632³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11257 + ... + 17032.

Almost surely, 2^81698632 is an apocalyptic number.

It is an amenable number.

81698632 is a deficient number, since it is larger than the sum of its proper divisors (79978718).

81698632 is a wasteful number, since it uses less digits than its factorization.

81698632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28333 (or 28310 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 81698632 is about 9038.7295567463. The cubic root of 81698632 is about 433.9152644498.

The spelling of 81698632 in words is "eighty-one million, six hundred ninety-eight thousand, six hundred thirty-two".