97821856 has 24 divisors (see below), whose sum is σ = 210095424. Its totient is φ = 44464320.

The previous prime is 97821839. The next prime is 97821869. The reversal of 97821856 is 65812879.

It is a super-2 number, since 2×97821856² = 19138231022569472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138600 + ... + 139303.

It is an arithmetic number, because the mean of its divisors is an integer number (8753976).

Almost surely, 2^97821856 is an apocalyptic number.

It is an amenable number.

97821856 is an abundant number, since it is smaller than the sum of its proper divisors (112273568).

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

97821856 is a wasteful number, since it uses less digits than its factorization.

97821856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277924 (or 277916 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 97821856 is about 9890.4932131820. The cubic root of 97821856 is about 460.7640986851.

The spelling of 97821856 in words is "ninety-seven million, eight hundred twenty-one thousand, eight hundred fifty-six".