978231100 has 108 divisors (see below), whose sum is σ = 2693968200. Its totient is φ = 304886400.

The previous prime is 978231091. The next prime is 978231109. The reversal of 978231100 is 1132879.

It is an interprime number because it is at equal distance from previous prime (978231091) and next prime (978231109).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978231109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 44826 + ... + 62974.

It is an arithmetic number, because the mean of its divisors is an integer number (24944150).

Almost surely, 2^978231100 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 978231100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346984100).

978231100 is an abundant number, since it is smaller than the sum of its proper divisors (1715737100).

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

978231100 is a wasteful number, since it uses less digits than its factorization.

978231100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18188 (or 18174 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 978231100 is about 31276.6862055429. The cubic root of 978231100 is about 992.6903999314.

Adding to 978231100 its reverse (1132879), we get a palindrome (979363979).

The spelling of 978231100 in words is "nine hundred seventy-eight million, two hundred thirty-one thousand, one hundred".