16118778 has 16 divisors (see below), whose sum is σ = 34717536. Its totient is φ = 4959600.

The previous prime is 16118777. The next prime is 16118789. The reversal of 16118778 is 87781161.

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

It is not an unprimeable number, because it can be changed into a prime (16118777) 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, 103248 + ... + 103403.

It is an arithmetic number, because the mean of its divisors is an integer number (2169846).

Almost surely, 2^16118778 is an apocalyptic number.

16118778 is an abundant number, since it is smaller than the sum of its proper divisors (18598758).

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

16118778 is a wasteful number, since it uses less digits than its factorization.

16118778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206669.

The product of its digits is 18816, while the sum is 39.

The square root of 16118778 is about 4014.8197967032. The cubic root of 16118778 is about 252.6062187491.

The spelling of 16118778 in words is "sixteen million, one hundred eighteen thousand, seven hundred seventy-eight".