215400060 has 288 divisors, whose sum is σ = 739694592. Its totient is φ = 52462080.

The previous prime is 215400049. The next prime is 215400061. The reversal of 215400060 is 60004512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215400061) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4582957 + ... + 4583003.

It is an arithmetic number, because the mean of its divisors is an integer number (2568384).

Almost surely, 2^215400060 is an apocalyptic number.

215400060 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 215400060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (369847296).

215400060 is an abundant number, since it is smaller than the sum of its proper divisors (524294532).

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

215400060 is a wasteful number, since it uses less digits than its factorization.

215400060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 215400060 is about 14676.5138912482. The cubic root of 215400060 is about 599.4439849045.

Adding to 215400060 its reverse (60004512), we get a palindrome (275404572).

The spelling of 215400060 in words is "two hundred fifteen million, four hundred thousand, sixty".