65878128 has 90 divisors (see below), whose sum is σ = 195974064. Its totient is φ = 20654592.

The previous prime is 65878121. The next prime is 65878139. The reversal of 65878128 is 82187856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65878121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40825 + ... + 42407.

Almost surely, 2^65878128 is an apocalyptic number.

65878128 is a gapful number since it is divisible by the number (68) 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 65878128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97987032).

65878128 is an abundant number, since it is smaller than the sum of its proper divisors (130095936).

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

65878128 is a wasteful number, since it uses less digits than its factorization.

65878128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631 (or 1605 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 65878128 is about 8116.5342357437. The cubic root of 65878128 is about 403.8751043526.

The spelling of 65878128 in words is "sixty-five million, eight hundred seventy-eight thousand, one hundred twenty-eight".