216151540 has 96 divisors (see below), whose sum is σ = 515281536. Its totient is φ = 75479040.

The previous prime is 216151519. The next prime is 216151567. The reversal of 216151540 is 45151612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 690424 + ... + 690736.

It is an arithmetic number, because the mean of its divisors is an integer number (5367516).

Almost surely, 2^216151540 is an apocalyptic number.

216151540 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 216151540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257640768).

216151540 is an abundant number, since it is smaller than the sum of its proper divisors (299129996).

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

216151540 is a wasteful number, since it uses less digits than its factorization.

216151540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 216151540 is about 14702.0930482704. The cubic root of 216151540 is about 600.1402820139.

The spelling of 216151540 in words is "two hundred sixteen million, one hundred fifty-one thousand, five hundred forty".