16778240 has 88 divisors (see below), whose sum is σ = 42004440. Its totient is φ = 6422528.

The previous prime is 16778231. The next prime is 16778291. The reversal of 16778240 is 4287761.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1024 + 16777216 = 32^2 + 4096^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16778240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (2) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148424 + ... + 148536.

Almost surely, 2^16778240 is an apocalyptic number.

16778240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16778240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21002220).

16778240 is an abundant number, since it is smaller than the sum of its proper divisors (25226200).

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

16778240 is a wasteful number, since it uses less digits than its factorization.

16778240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 16778240 is about 4096.1249980927. The cubic root of 16778240 is about 256.0052082274.

The spelling of 16778240 in words is "sixteen million, seven hundred seventy-eight thousand, two hundred forty".