65544880 has 20 divisors (see below), whose sum is σ = 152392032. Its totient is φ = 26217920.

The previous prime is 65544833. The next prime is 65544887. The reversal of 65544880 is 8844556.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×65544880² = 8592262588428800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (65544887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409576 + ... + 409735.

Almost surely, 2^65544880 is an apocalyptic number.

It is an amenable number.

65544880 is an abundant number, since it is smaller than the sum of its proper divisors (86847152).

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

65544880 is a wasteful number, since it uses less digits than its factorization.

65544880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819324 (or 819318 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 65544880 is about 8095.9792489853. The cubic root of 65544880 is about 403.1929449404.

The spelling of 65544880 in words is "sixty-five million, five hundred forty-four thousand, eight hundred eighty".