231067640 has 32 divisors (see below), whose sum is σ = 521570880. Its totient is φ = 92130432.

The previous prime is 231067633. The next prime is 231067643. The reversal of 231067640 is 46760132.

231067640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231067643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3569 + ... + 21791.

It is an arithmetic number, because the mean of its divisors is an integer number (16299090).

Almost surely, 2^231067640 is an apocalyptic number.

231067640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231067640 is an abundant number, since it is smaller than the sum of its proper divisors (290503240).

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

231067640 is a wasteful number, since it uses less digits than its factorization.

231067640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18551 (or 18547 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 231067640 is about 15200.9091833351. The cubic root of 231067640 is about 613.6391262893.

The spelling of 231067640 in words is "two hundred thirty-one million, sixty-seven thousand, six hundred forty".