65278560 has 192 divisors, whose sum is σ = 219469824. Its totient is φ = 16281600.

The previous prime is 65278553. The next prime is 65278561. The reversal of 65278560 is 6587256.

It is a happy number.

It is a super-2 number, since 2×65278560² = 8522580791347200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65278561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 610027 + ... + 610133.

It is an arithmetic number, because the mean of its divisors is an integer number (1143072).

Almost surely, 2^65278560 is an apocalyptic number.

65278560 is a gapful number since it is divisible by the number (60) 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 65278560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109734912).

65278560 is an abundant number, since it is smaller than the sum of its proper divisors (154191264).

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

65278560 is a wasteful number, since it uses less digits than its factorization.

65278560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 65278560 is about 8079.5148369194. The cubic root of 65278560 is about 402.6461231472.

The spelling of 65278560 in words is "sixty-five million, two hundred seventy-eight thousand, five hundred sixty".