81902722 has 24 divisors (see below), whose sum is σ = 136343088. Its totient is φ = 36868920.

The previous prime is 81902693. The next prime is 81902729. The reversal of 81902722 is 22720918.

It is not an unprimeable number, because it can be changed into a prime (81902729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24313 + ... + 27475.

It is an arithmetic number, because the mean of its divisors is an integer number (5680962).

Almost surely, 2^81902722 is an apocalyptic number.

81902722 is a deficient number, since it is larger than the sum of its proper divisors (54440366).

81902722 is a wasteful number, since it uses less digits than its factorization.

81902722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294 (or 3283 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81902722 is about 9050.0122651851. The cubic root of 81902722 is about 434.2762828445.

The spelling of 81902722 in words is "eighty-one million, nine hundred two thousand, seven hundred twenty-two".