231620736 has 64 divisors (see below), whose sum is σ = 617899680. Its totient is φ = 76873728.

The previous prime is 231620729. The next prime is 231620737. The reversal of 231620736 is 637026132.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (231620737) 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, 97515 + ... + 99861.

Almost surely, 2^231620736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231620736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308949840).

231620736 is an abundant number, since it is smaller than the sum of its proper divisors (386278944).

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

231620736 is a wasteful number, since it uses less digits than its factorization.

231620736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621 (or 2609 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 231620736 is about 15219.0911686605. The cubic root of 231620736 is about 614.1283494198.

Adding to 231620736 its reverse (637026132), we get a palindrome (868646868).

The spelling of 231620736 in words is "two hundred thirty-one million, six hundred twenty thousand, seven hundred thirty-six".