81002722 has 16 divisors (see below), whose sum is σ = 128905560. Its totient is φ = 38043648.

The previous prime is 81002717. The next prime is 81002723. The reversal of 81002722 is 22720018.

It can be written as a sum of positive squares in 4 ways, for example, as 79584241 + 1418481 = 8921^2 + 1191^2 .

It is a super-2 number, since 2×81002722² = 13122881942818568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81002693 and 81002702.

It is not an unprimeable number, because it can be changed into a prime (81002723) 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, 17554 + ... + 21682.

Almost surely, 2^81002722 is an apocalyptic number.

81002722 is a deficient number, since it is larger than the sum of its proper divisors (47902838).

81002722 is a wasteful number, since it uses less digits than its factorization.

81002722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 81002722 is about 9000.1512209518. The cubic root of 81002722 is about 432.6797177087.

The spelling of 81002722 in words is "eighty-one million, two thousand, seven hundred twenty-two".