18068778 has 64 divisors (see below), whose sum is σ = 49432320. Its totient is φ = 4764096.

The previous prime is 18068767. The next prime is 18068803. The reversal of 18068778 is 87786081.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3076 + ... + 6752.

It is an arithmetic number, because the mean of its divisors is an integer number (772380).

Almost surely, 2^18068778 is an apocalyptic number.

18068778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18068778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24716160).

18068778 is an abundant number, since it is smaller than the sum of its proper divisors (31363542).

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

18068778 is a wasteful number, since it uses less digits than its factorization.

18068778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708 (or 3702 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 18068778 is about 4250.7385240685. The cubic root of 18068778 is about 262.4075102730.

The spelling of 18068778 in words is "eighteen million, sixty-eight thousand, seven hundred seventy-eight".