97447780 has 48 divisors (see below), whose sum is σ = 214502400. Its totient is φ = 37116288.

The previous prime is 97447771. The next prime is 97447781. The reversal of 97447780 is 8774479.

97447780 is a nontrivial binomial coefficient, being equal to C(13961, 2).

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 97447780.

It is not an unprimeable number, because it can be changed into a prime (97447781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160237 + ... + 160843.

It is an arithmetic number, because the mean of its divisors is an integer number (4468800).

Almost surely, 2^97447780 is an apocalyptic number.

97447780 is the 13960-th triangular number.

97447780 is the 4654-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97447780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107251200).

97447780 is an abundant number, since it is smaller than the sum of its proper divisors (117054620).

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

97447780 is a wasteful number, since it uses less digits than its factorization.

97447780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988 (or 986 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 97447780 is about 9871.5642124235. The cubic root of 97447780 is about 460.1760195938.

The spelling of 97447780 in words is "ninety-seven million, four hundred forty-seven thousand, seven hundred eighty".