65878398 has 24 divisors (see below), whose sum is σ = 143006448. Its totient is φ = 21917952.

The previous prime is 65878391. The next prime is 65878399. The reversal of 65878398 is 89387856.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65878391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7215 + ... + 13557.

It is an arithmetic number, because the mean of its divisors is an integer number (5958602).

Almost surely, 2^65878398 is an apocalyptic number.

65878398 is an abundant number, since it is smaller than the sum of its proper divisors (77128050).

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

65878398 is a wasteful number, since it uses less digits than its factorization.

65878398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6928 (or 6925 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 65878398 is about 8116.5508684416. The cubic root of 65878398 is about 403.8756561095.

The spelling of 65878398 in words is "sixty-five million, eight hundred seventy-eight thousand, three hundred ninety-eight".