97821620 has 24 divisors (see below), whose sum is σ = 221227944. Its totient is φ = 36118656.

The previous prime is 97821601. The next prime is 97821637. The reversal of 97821620 is 2612879.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17073424 + 80748196 = 4132^2 + 8986^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187859 + ... + 188378.

It is an arithmetic number, because the mean of its divisors is an integer number (9217831).

Almost surely, 2^97821620 is an apocalyptic number.

It is an amenable number.

97821620 is an abundant number, since it is smaller than the sum of its proper divisors (123406324).

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

97821620 is a wasteful number, since it uses less digits than its factorization.

97821620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376259 (or 376257 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 97821620 is about 9890.4812825261. The cubic root of 97821620 is about 460.7637281462.

The spelling of 97821620 in words is "ninety-seven million, eight hundred twenty-one thousand, six hundred twenty".