97889640 has 64 divisors (see below), whose sum is σ = 296308800. Its totient is φ = 25869312.

The previous prime is 97889639. The next prime is 97889647. The reversal of 97889640 is 4698879.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (97889647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9951 + ... + 17169.

It is an arithmetic number, because the mean of its divisors is an integer number (4629825).

Almost surely, 2^97889640 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 97889640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148154400).

97889640 is an abundant number, since it is smaller than the sum of its proper divisors (198419160).

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

97889640 is a wasteful number, since it uses less digits than its factorization.

97889640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7346 (or 7342 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 97889640 is about 9893.9193447289. The cubic root of 97889640 is about 460.8705003412.

The spelling of 97889640 in words is "ninety-seven million, eight hundred eighty-nine thousand, six hundred forty".