216133540 has 24 divisors (see below), whose sum is σ = 518720832. Its totient is φ = 74102880.

The previous prime is 216133537. The next prime is 216133633. The reversal of 216133540 is 45331612.

It is a super-2 number, since 2×216133540² = 93427414225863200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771766 + ... + 772045.

It is an arithmetic number, because the mean of its divisors is an integer number (21613368).

Almost surely, 2^216133540 is an apocalyptic number.

216133540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216133540 is an abundant number, since it is smaller than the sum of its proper divisors (302587292).

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

216133540 is a wasteful number, since it uses less digits than its factorization.

216133540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543827 (or 1543825 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 216133540 is about 14701.4808777891. The cubic root of 216133540 is about 600.1236226755.

The spelling of 216133540 in words is "two hundred sixteen million, one hundred thirty-three thousand, five hundred forty".