65444080 has 40 divisors (see below), whose sum is σ = 163864512. Its totient is φ = 24163584.

The previous prime is 65444051. The next prime is 65444081. The reversal of 65444080 is 8044456.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65444081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30424 + ... + 32503.

Almost surely, 2^65444080 is an apocalyptic number.

It is an amenable number.

65444080 is an abundant number, since it is smaller than the sum of its proper divisors (98420432).

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

65444080 is a wasteful number, since it uses less digits than its factorization.

65444080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62953 (or 62947 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 65444080 is about 8089.7515413021. The cubic root of 65444080 is about 402.9861517694.

The spelling of 65444080 in words is "sixty-five million, four hundred forty-four thousand, eighty".