65787918 has 48 divisors (see below), whose sum is σ = 158739840. Its totient is φ = 17803152.

The previous prime is 65787913. The next prime is 65787919. The reversal of 65787918 is 81978756.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65787913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12993 + ... + 17331.

It is an arithmetic number, because the mean of its divisors is an integer number (3307080).

Almost surely, 2^65787918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65787918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79369920).

65787918 is an abundant number, since it is smaller than the sum of its proper divisors (92951922).

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

65787918 is a wasteful number, since it uses less digits than its factorization.

65787918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389 (or 4370 counting only the distinct ones).

The product of its digits is 846720, while the sum is 51.

The square root of 65787918 is about 8110.9751571559. The cubic root of 65787918 is about 403.6906717901.

The spelling of 65787918 in words is "sixty-five million, seven hundred eighty-seven thousand, nine hundred eighteen".