215641464 has 64 divisors (see below), whose sum is σ = 576577440. Its totient is φ = 66969600.

The previous prime is 215641463. The next prime is 215641501. The reversal of 215641464 is 464146512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215641463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38592 + ... + 43824.

Almost surely, 2^215641464 is an apocalyptic number.

215641464 is a gapful number since it is divisible by the number (24) 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 215641464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288288720).

215641464 is an abundant number, since it is smaller than the sum of its proper divisors (360935976).

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

215641464 is a wasteful number, since it uses less digits than its factorization.

215641464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360 (or 5356 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 215641464 is about 14684.7357483885. The cubic root of 215641464 is about 599.6678383706.

Adding to 215641464 its reverse (464146512), we get a palindrome (679787976).

The spelling of 215641464 in words is "two hundred fifteen million, six hundred forty-one thousand, four hundred sixty-four".