65531136 has 72 divisors (see below), whose sum is σ = 190288224. Its totient is φ = 19855360.

The previous prime is 65531119. The next prime is 65531143. The reversal of 65531136 is 63113556.

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, 4570 + ... + 12326.

It is an arithmetic number, because the mean of its divisors is an integer number (2642892).

Almost surely, 2^65531136 is an apocalyptic number.

65531136 is a gapful number since it is divisible by the number (66) 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 65531136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95144112).

65531136 is an abundant number, since it is smaller than the sum of its proper divisors (124757088).

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

65531136 is a wasteful number, since it uses less digits than its factorization.

65531136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787 (or 7773 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 65531136 is about 8095.1303880790. The cubic root of 65531136 is about 403.1647613446.

The spelling of 65531136 in words is "sixty-five million, five hundred thirty-one thousand, one hundred thirty-six".