81922628 has 6 divisors (see below), whose sum is σ = 143364606. Its totient is φ = 40961312.

The previous prime is 81922613. The next prime is 81922663. The reversal of 81922628 is 82622918.

It can be written as a sum of positive squares in only one way, i.e., 73582084 + 8340544 = 8578^2 + 2888^2 .

It is a super-2 number, since 2×81922628² = 13422633956852768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81922591 and 81922600.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240325 + ... + 10240332.

It is an arithmetic number, because the mean of its divisors is an integer number (23894101).

Almost surely, 2^81922628 is an apocalyptic number.

It is an amenable number.

81922628 is a deficient number, since it is larger than the sum of its proper divisors (61441978).

81922628 is a wasteful number, since it uses less digits than its factorization.

81922628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20480661 (or 20480659 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 81922628 is about 9051.1119758845. Note that the first 3 decimals coincide. The cubic root of 81922628 is about 434.3114628044.

The spelling of 81922628 in words is "eighty-one million, nine hundred twenty-two thousand, six hundred twenty-eight".