82221970 has 32 divisors (see below), whose sum is σ = 150456240. Its totient is φ = 32348160.

The previous prime is 82221967. The next prime is 82221973. The reversal of 82221970 is 7912228.

It is an interprime number because it is at equal distance from previous prime (82221967) and next prime (82221973).

It can be written as a sum of positive squares in 8 ways, for example, as 25836889 + 56385081 = 5083^2 + 7509^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (82221973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262534 + ... + 262846.

Almost surely, 2^82221970 is an apocalyptic number.

82221970 is a deficient number, since it is larger than the sum of its proper divisors (68234270).

82221970 is a wasteful number, since it uses less digits than its factorization.

82221970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

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

The square root of 82221970 is about 9067.6330980030. The cubic root of 82221970 is about 434.8398053724.

The spelling of 82221970 in words is "eighty-two million, two hundred twenty-one thousand, nine hundred seventy".