216878124490 has 16 divisors (see below), whose sum is σ = 396780307560. Its totient is φ = 85329097920.

The previous prime is 216878124487. The next prime is 216878124497. The reversal of 216878124490 is 94421878612.

It can be written as a sum of positive squares in 4 ways, for example, as 154369624201 + 62508500289 = 392899^2 + 250017^2 .

It is a super-2 number, since 2×216878124490² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216878124497) 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, 177768345 + ... + 177769564.

Almost surely, 2^216878124490 is an apocalyptic number.

216878124490 is a deficient number, since it is larger than the sum of its proper divisors (179902183070).

216878124490 is a wasteful number, since it uses less digits than its factorization.

216878124490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355537977.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 216878124490 in words is "two hundred sixteen billion, eight hundred seventy-eight million, one hundred twenty-four thousand, four hundred ninety".