216705057 has 8 divisors (see below), whose sum is σ = 301502784. Its totient is φ = 138188688.

The previous prime is 216705007. The next prime is 216705061. The reversal of 216705057 is 750507612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216705057 - 2¹⁵ = 216672289 is a prime.

It is a super-2 number, since 2×216705057² = 93922163458746498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216705007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1570258 + ... + 1570395.

It is an arithmetic number, because the mean of its divisors is an integer number (37687848).

Almost surely, 2^216705057 is an apocalyptic number.

It is an amenable number.

216705057 is a deficient number, since it is larger than the sum of its proper divisors (84797727).

216705057 is a wasteful number, since it uses less digits than its factorization.

216705057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140679.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 216705057 is about 14720.9054409027. The cubic root of 216705057 is about 600.6521215280.

The spelling of 216705057 in words is "two hundred sixteen million, seven hundred five thousand, fifty-seven".