65777488 has 80 divisors (see below), whose sum is σ = 155882880. Its totient is φ = 26247168.

The previous prime is 65777419. The next prime is 65777519. The reversal of 65777488 is 88477756.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340720 + ... + 340912.

It is an arithmetic number, because the mean of its divisors is an integer number (1948536).

Almost surely, 2^65777488 is an apocalyptic number.

65777488 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65777488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77941440).

65777488 is an abundant number, since it is smaller than the sum of its proper divisors (90105392).

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

65777488 is a wasteful number, since it uses less digits than its factorization.

65777488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 398 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 52.

The square root of 65777488 is about 8110.3321756880. The cubic root of 65777488 is about 403.6693369900.

It can be divided in two parts, 6577748 and 8, that added together give a palindrome (6577756).

The spelling of 65777488 in words is "sixty-five million, seven hundred seventy-seven thousand, four hundred eighty-eight".