65663280 has 60 divisors (see below), whose sum is σ = 220521600. Its totient is φ = 17510016.

The previous prime is 65663261. The next prime is 65663291. The reversal of 65663280 is 8236656.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44880 + ... + 46319.

It is an arithmetic number, because the mean of its divisors is an integer number (3675360).

Almost surely, 2^65663280 is an apocalyptic number.

65663280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65663280 is an abundant number, since it is smaller than the sum of its proper divisors (154858320).

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

65663280 is a wasteful number, since it uses less digits than its factorization.

65663280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91218 (or 91209 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 65663280 is about 8103.2882214568. The cubic root of 65663280 is about 403.4355742599.

It can be divided in two parts, 656 and 63280, that added together give a palindrome (63936).

The spelling of 65663280 in words is "sixty-five million, six hundred sixty-three thousand, two hundred eighty".