97209128 has 16 divisors (see below), whose sum is σ = 192988980. Its totient is φ = 45745408.

The previous prime is 97209121. The next prime is 97209137. The reversal of 97209128 is 82190279.

It can be written as a sum of positive squares in 2 ways, for example, as 92891044 + 4318084 = 9638^2 + 2078^2 .

It is a super-2 number, since 2×97209128² = 18899229133040768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 97209091 and 97209100.

It is not an unprimeable number, because it can be changed into a prime (97209121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357251 + ... + 357522.

Almost surely, 2^97209128 is an apocalyptic number.

It is an amenable number.

97209128 is a deficient number, since it is larger than the sum of its proper divisors (95779852).

97209128 is a wasteful number, since it uses less digits than its factorization.

97209128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714796 (or 714792 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 97209128 is about 9859.4689512164. The cubic root of 97209128 is about 459.8000517274.

The spelling of 97209128 in words is "ninety-seven million, two hundred nine thousand, one hundred twenty-eight".