81722654 has 12 divisors (see below), whose sum is σ = 132739416. Its totient is φ = 37717992.

The previous prime is 81722651. The next prime is 81722777. The reversal of 81722654 is 45622718.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81722651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120554 + ... + 121229.

It is an arithmetic number, because the mean of its divisors is an integer number (11061618).

Almost surely, 2^81722654 is an apocalyptic number.

81722654 is a deficient number, since it is larger than the sum of its proper divisors (51016762).

81722654 is a wasteful number, since it uses less digits than its factorization.

81722654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241811 (or 241798 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 81722654 is about 9040.0582962722. The cubic root of 81722654 is about 433.9577885850.

The spelling of 81722654 in words is "eighty-one million, seven hundred twenty-two thousand, six hundred fifty-four".