216702440 has 32 divisors (see below), whose sum is σ = 489404160. Its totient is φ = 86356800.

The previous prime is 216702403. The next prime is 216702461. The reversal of 216702440 is 44207612.

It is a super-5 number, since 5×216702440⁵ (a number of 43 digits) contains 55555 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, 845 + ... + 20835.

It is an arithmetic number, because the mean of its divisors is an integer number (15293880).

Almost surely, 2^216702440 is an apocalyptic number.

216702440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216702440 is an abundant number, since it is smaller than the sum of its proper divisors (272701720).

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

216702440 is a wasteful number, since it uses less digits than its factorization.

216702440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20273 (or 20269 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 216702440 is about 14720.8165534389. The cubic root of 216702440 is about 600.6497036288.

The spelling of 216702440 in words is "two hundred sixteen million, seven hundred two thousand, four hundred forty".