65407878438 has 48 divisors (see below), whose sum is σ = 153650914560. Its totient is φ = 18506520144.

The previous prime is 65407878433. The next prime is 65407878443. The reversal of 65407878438 is 83487870456.

It is a happy number.

65407878438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65407878433) and next prime (65407878443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65407878433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1049698 + ... + 1110261.

It is an arithmetic number, because the mean of its divisors is an integer number (3201060720).

Almost surely, 2^65407878438 is an apocalyptic number.

65407878438 is an abundant number, since it is smaller than the sum of its proper divisors (88243036122).

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

65407878438 is a wasteful number, since it uses less digits than its factorization.

65407878438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160081 (or 2160074 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 60.

The spelling of 65407878438 in words is "sixty-five billion, four hundred seven million, eight hundred seventy-eight thousand, four hundred thirty-eight".