231678720 has 648 divisors, whose sum is σ = 1050338016. Its totient is φ = 46006272.

The previous prime is 231678691. The next prime is 231678731. The reversal of 231678720 is 27876132.

231678720 = T₃₆₂₁ + T₃₆₂₂ + ... + T₃₆₅₅.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13628152 + ... + 13628168.

It is an arithmetic number, because the mean of its divisors is an integer number (1620892).

Almost surely, 2^231678720 is an apocalyptic number.

231678720 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 231678720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (525169008).

231678720 is an abundant number, since it is smaller than the sum of its proper divisors (818659296).

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

231678720 is a wasteful number, since it uses less digits than its factorization.

231678720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 231678720 is about 15220.9960252278. The cubic root of 231678720 is about 614.1795921650.

The spelling of 231678720 in words is "two hundred thirty-one million, six hundred seventy-eight thousand, seven hundred twenty".