231878640 has 320 divisors, whose sum is σ = 910227456. Its totient is φ = 47579136.

The previous prime is 231878627. The next prime is 231878659. The reversal of 231878640 is 46878132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 656704 + ... + 657056.

Almost surely, 2^231878640 is an apocalyptic number.

231878640 is a gapful number since it is divisible by the number (20) 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 231878640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455113728).

231878640 is an abundant number, since it is smaller than the sum of its proper divisors (678348816).

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

231878640 is a wasteful number, since it uses less digits than its factorization.

231878640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 231878640 is about 15227.5618534288. The cubic root of 231878640 is about 614.3562038145.

The spelling of 231878640 in words is "two hundred thirty-one million, eight hundred seventy-eight thousand, six hundred forty".