988131978 has 24 divisors (see below), whose sum is σ = 2142099648. Its totient is φ = 329200872.

The previous prime is 988131973. The next prime is 988132001. The reversal of 988131978 is 879131889.

It is not an unprimeable number, because it can be changed into a prime (988131971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22351 + ... + 49757.

It is an arithmetic number, because the mean of its divisors is an integer number (89254152).

Almost surely, 2^988131978 is an apocalyptic number.

988131978 is an abundant number, since it is smaller than the sum of its proper divisors (1153967670).

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

988131978 is a wasteful number, since it uses less digits than its factorization.

988131978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29418 (or 29415 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 988131978 is about 31434.5666106597. The cubic root of 988131978 is about 996.0282386632.

The spelling of 988131978 in words is "nine hundred eighty-eight million, one hundred thirty-one thousand, nine hundred seventy-eight".