65281788 has 120 divisors (see below), whose sum is σ = 200637360. Its totient is φ = 18247680.

The previous prime is 65281787. The next prime is 65281793. The reversal of 65281788 is 88718256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65281781) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 45628 + ... + 47036.

It is an arithmetic number, because the mean of its divisors is an integer number (1671978).

Almost surely, 2^65281788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65281788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100318680).

65281788 is an abundant number, since it is smaller than the sum of its proper divisors (135355572).

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

65281788 is a wasteful number, since it uses less digits than its factorization.

65281788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449 (or 1438 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 65281788 is about 8079.7145989199. The cubic root of 65281788 is about 402.6527599371.

The spelling of 65281788 in words is "sixty-five million, two hundred eighty-one thousand, seven hundred eighty-eight".