97881820 has 24 divisors (see below), whose sum is σ = 208924128. Its totient is φ = 38510400.

The previous prime is 97881779. The next prime is 97881829. The reversal of 97881820 is 2818879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97881829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38896 + ... + 41335.

It is an arithmetic number, because the mean of its divisors is an integer number (8705172).

Almost surely, 2^97881820 is an apocalyptic number.

It is an amenable number.

97881820 is an abundant number, since it is smaller than the sum of its proper divisors (111042308).

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

97881820 is a wasteful number, since it uses less digits than its factorization.

97881820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80301 (or 80299 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 97881820 is about 9893.5241446110. The cubic root of 97881820 is about 460.8582276660.

The spelling of 97881820 in words is "ninety-seven million, eight hundred eighty-one thousand, eight hundred twenty".