65401440 has 192 divisors, whose sum is σ = 227598336. Its totient is φ = 15685632.

The previous prime is 65401433. The next prime is 65401451. The reversal of 65401440 is 4410456.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65401440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293169 + ... + 293391.

It is an arithmetic number, because the mean of its divisors is an integer number (1185408).

Almost surely, 2^65401440 is an apocalyptic number.

65401440 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 65401440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113799168).

65401440 is an abundant number, since it is smaller than the sum of its proper divisors (162196896).

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

65401440 is a wasteful number, since it uses less digits than its factorization.

65401440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 65401440 is about 8087.1156786582. The cubic root of 65401440 is about 402.8986110640.

Adding to 65401440 its reverse (4410456), we get a palindrome (69811896).

The spelling of 65401440 in words is "sixty-five million, four hundred one thousand, four hundred forty".