97807840 has 96 divisors (see below), whose sum is σ = 253380960. Its totient is φ = 35457024.

The previous prime is 97807823. The next prime is 97807861. The reversal of 97807840 is 4870879.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122322 + ... + 123118.

It is an arithmetic number, because the mean of its divisors is an integer number (2639385).

Almost surely, 2^97807840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97807840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126690480).

97807840 is an abundant number, since it is smaller than the sum of its proper divisors (155573120).

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

97807840 is a wasteful number, since it uses less digits than its factorization.

97807840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 97807840 is about 9889.7846285953. The cubic root of 97807840 is about 460.7420914080.

The spelling of 97807840 in words is "ninety-seven million, eight hundred seven thousand, eight hundred forty".