65755440 has 120 divisors (see below), whose sum is σ = 222301248. Its totient is φ = 17418240.

The previous prime is 65755429. The next prime is 65755477. The reversal of 65755440 is 4455756.

It is a happy number.

65755440 is a `hidden beast` number, since 65 + 7 + 554 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65755395 and 65755404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194952 + ... + 195288.

Almost surely, 2^65755440 is an apocalyptic number.

65755440 is a gapful number since it is divisible by the number (60) 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 65755440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111150624).

65755440 is an abundant number, since it is smaller than the sum of its proper divisors (156545808).

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

65755440 is a wasteful number, since it uses less digits than its factorization.

65755440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The square root of 65755440 is about 8108.9728079455. The cubic root of 65755440 is about 403.6242298852.

The spelling of 65755440 in words is "sixty-five million, seven hundred fifty-five thousand, four hundred forty".