65419840 has 28 divisors (see below), whose sum is σ = 155781756. Its totient is φ = 26167808.

The previous prime is 65419801. The next prime is 65419903. The reversal of 65419840 is 4891456.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24049216 + 41370624 = 4904^2 + 6432^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 65419840.

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, 101899 + ... + 102538.

Almost surely, 2^65419840 is an apocalyptic number.

It is an amenable number.

65419840 is an abundant number, since it is smaller than the sum of its proper divisors (90361916).

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

65419840 is a wasteful number, since it uses less digits than its factorization.

65419840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204454 (or 204444 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 65419840 is about 8088.2532106753. The cubic root of 65419840 is about 402.9363912685.

The spelling of 65419840 in words is "sixty-five million, four hundred nineteen thousand, eight hundred forty".