97821860 has 12 divisors (see below), whose sum is σ = 205425948. Its totient is φ = 39128736.

The previous prime is 97821839. The next prime is 97821869. The reversal of 97821860 is 6812879.

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 82156096 = 3958^2 + 9064^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (97821869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2445527 + ... + 2445566.

It is an arithmetic number, because the mean of its divisors is an integer number (17118829).

Almost surely, 2^97821860 is an apocalyptic number.

It is an amenable number.

97821860 is an abundant number, since it is smaller than the sum of its proper divisors (107604088).

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

97821860 is a wasteful number, since it uses less digits than its factorization.

97821860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891102 (or 4891100 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 97821860 is about 9890.4934153964. The cubic root of 97821860 is about 460.7641049654.

The spelling of 97821860 in words is "ninety-seven million, eight hundred twenty-one thousand, eight hundred sixty".