65440878 has 16 divisors (see below), whose sum is σ = 135395280. Its totient is φ = 21061376.

The previous prime is 65440841. The next prime is 65440889. The reversal of 65440878 is 87804456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187875 + ... + 188222.

It is an arithmetic number, because the mean of its divisors is an integer number (8462205).

Almost surely, 2^65440878 is an apocalyptic number.

65440878 is an abundant number, since it is smaller than the sum of its proper divisors (69954402).

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

65440878 is a wasteful number, since it uses less digits than its factorization.

65440878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376131.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 65440878 is about 8089.5536341630. The cubic root of 65440878 is about 402.9795793251.

The spelling of 65440878 in words is "sixty-five million, four hundred forty thousand, eight hundred seventy-eight".