97820775 has 72 divisors (see below), whose sum is σ = 192550176. Its totient is φ = 47174400.

The previous prime is 97820719. The next prime is 97820777. The reversal of 97820775 is 57702879.

It is not a de Polignac number, because 97820775 - 2⁷ = 97820647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 97820775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97820777) 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 71 ways as a sum of consecutive naturals, for example, 154710 + ... + 155340.

It is an arithmetic number, because the mean of its divisors is an integer number (2674308).

Almost surely, 2^97820775 is an apocalyptic number.

97820775 is a deficient number, since it is larger than the sum of its proper divisors (94729401).

97820775 is a wasteful number, since it uses less digits than its factorization.

97820775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 97820775 is about 9890.4385645936. The cubic root of 97820775 is about 460.7624014235.

The spelling of 97820775 in words is "ninety-seven million, eight hundred twenty thousand, seven hundred seventy-five".