215437252040 has 128 divisors (see below), whose sum is σ = 512870745600. Its totient is φ = 81313397760.

The previous prime is 215437252039. The next prime is 215437252049. The reversal of 215437252040 is 40252734512.

It is not an unprimeable number, because it can be changed into a prime (215437252049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42904730 + ... + 42909750.

It is an arithmetic number, because the mean of its divisors is an integer number (4006802700).

Almost surely, 2^215437252040 is an apocalyptic number.

215437252040 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 215437252040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256435372800).

215437252040 is an abundant number, since it is smaller than the sum of its proper divisors (297433493560).

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

215437252040 is a wasteful number, since it uses less digits than its factorization.

215437252040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5895 (or 5891 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

Adding to 215437252040 its reverse (40252734512), we get a palindrome (255689986552).

The spelling of 215437252040 in words is "two hundred fifteen billion, four hundred thirty-seven million, two hundred fifty-two thousand, forty".