16878225 has 48 divisors (see below), whose sum is σ = 34358912. Its totient is φ = 7119360.

The previous prime is 16878223. The next prime is 16878259. The reversal of 16878225 is 52287861.

It is not a de Polignac number, because 16878225 - 2¹ = 16878223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16878223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5589 + ... + 8061.

Almost surely, 2^16878225 is an apocalyptic number.

16878225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16878225 is an abundant number, since it is smaller than the sum of its proper divisors (17480687).

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

16878225 is a wasteful number, since it uses less digits than its factorization.

16878225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506 (or 2501 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 16878225 is about 4108.3116970357. The cubic root of 16878225 is about 256.5127307309.

The spelling of 16878225 in words is "sixteen million, eight hundred seventy-eight thousand, two hundred twenty-five".