216797477 has 16 divisors (see below), whose sum is σ = 244984320. Its totient is φ = 190468800.

The previous prime is 216797473. The next prime is 216797501. The reversal of 216797477 is 774797612.

It is a cyclic number.

It is not a de Polignac number, because 216797477 - 2² = 216797473 is a prime.

It is a super-2 number, since 2×216797477² = 94002292067131058, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216797473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20174 + ... + 28992.

It is an arithmetic number, because the mean of its divisors is an integer number (15311520).

Almost surely, 2^216797477 is an apocalyptic number.

It is an amenable number.

216797477 is a deficient number, since it is larger than the sum of its proper divisors (28186843).

216797477 is a wasteful number, since it uses less digits than its factorization.

216797477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8924.

The product of its digits is 1037232, while the sum is 50.

The square root of 216797477 is about 14724.0441795045. The cubic root of 216797477 is about 600.7374977533.

The spelling of 216797477 in words is "two hundred sixteen million, seven hundred ninety-seven thousand, four hundred seventy-seven".