216479457 has 6 divisors (see below), whose sum is σ = 312692562. Its totient is φ = 144319632.

The previous prime is 216479441. The next prime is 216479477. The reversal of 216479457 is 754974612.

It can be written as a sum of positive squares in only one way, i.e., 111703761 + 104775696 = 10569^2 + 10236^2 .

It is not a de Polignac number, because 216479457 - 2⁴ = 216479441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216479477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12026628 + ... + 12026645.

It is an arithmetic number, because the mean of its divisors is an integer number (52115427).

Almost surely, 2^216479457 is an apocalyptic number.

It is an amenable number.

216479457 is a deficient number, since it is larger than the sum of its proper divisors (96213105).

216479457 is a wasteful number, since it uses less digits than its factorization.

216479457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24053279 (or 24053276 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 216479457 is about 14713.2408734446. The cubic root of 216479457 is about 600.4436135975.

The spelling of 216479457 in words is "two hundred sixteen million, four hundred seventy-nine thousand, four hundred fifty-seven".