231428988 has 120 divisors (see below), whose sum is σ = 702210432. Its totient is φ = 65092896.

The previous prime is 231428971. The next prime is 231429017. The reversal of 231428988 is 889824132.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 151195 + ... + 152717.

Almost surely, 2^231428988 is an apocalyptic number.

231428988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231428988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (351105216).

231428988 is an abundant number, since it is smaller than the sum of its proper divisors (470781444).

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

231428988 is a wasteful number, since it uses less digits than its factorization.

231428988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613 (or 1602 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 231428988 is about 15212.7902766061. The cubic root of 231428988 is about 613.9588332311.

The spelling of 231428988 in words is "two hundred thirty-one million, four hundred twenty-eight thousand, nine hundred eighty-eight".