97821816 has 16 divisors (see below), whose sum is σ = 244554600. Its totient is φ = 32607264.

The previous prime is 97821803. The next prime is 97821817. The reversal of 97821816 is 61812879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97821817) 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, 2037931 + ... + 2037978.

Almost surely, 2^97821816 is an apocalyptic number.

It is an amenable number.

97821816 is an abundant number, since it is smaller than the sum of its proper divisors (146732784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

97821816 is a wasteful number, since it uses less digits than its factorization.

97821816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075918 (or 4075914 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 97821816 is about 9890.4911910380. The cubic root of 97821816 is about 460.7640358819.

The spelling of 97821816 in words is "ninety-seven million, eight hundred twenty-one thousand, eight hundred sixteen".