65778448 has 20 divisors (see below), whose sum is σ = 128618380. Its totient is φ = 32586624.

The previous prime is 65778431. The next prime is 65778509. The reversal of 65778448 is 84487756.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 58553104 + 7225344 = 7652^2 + 2688^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17115 + ... + 20602.

It is an arithmetic number, because the mean of its divisors is an integer number (6430919).

Almost surely, 2^65778448 is an apocalyptic number.

It is an amenable number.

65778448 is a deficient number, since it is larger than the sum of its proper divisors (62839932).

65778448 is a wasteful number, since it uses less digits than its factorization.

65778448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37834 (or 37828 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 49.

The square root of 65778448 is about 8110.3913592379. The cubic root of 65778448 is about 403.6713007858.

The spelling of 65778448 in words is "sixty-five million, seven hundred seventy-eight thousand, four hundred forty-eight".