16778560 has 28 divisors (see below), whose sum is σ = 39954708. Its totient is φ = 6711296.

The previous prime is 16778549. The next prime is 16778561. The reversal of 16778560 is 6587761.

It can be written as a sum of positive squares in 2 ways, for example, as 9935104 + 6843456 = 3152^2 + 2616^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16778561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25897 + ... + 26536.

Almost surely, 2^16778560 is an apocalyptic number.

16778560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16778560 is an abundant number, since it is smaller than the sum of its proper divisors (23176148).

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

16778560 is an equidigital number, since it uses as much as digits as its factorization.

16778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52450 (or 52440 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 16778560 is about 4096.1640592144. The cubic root of 16778560 is about 256.0068357550.

The spelling of 16778560 in words is "sixteen million, seven hundred seventy-eight thousand, five hundred sixty".