65540880 has 160 divisors (see below), whose sum is σ = 237782400. Its totient is φ = 16547328.

The previous prime is 65540873. The next prime is 65540897. The reversal of 65540880 is 8804556.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 40242 + ... + 41838.

It is an arithmetic number, because the mean of its divisors is an integer number (1486140).

Almost surely, 2^65540880 is an apocalyptic number.

65540880 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 65540880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118891200).

65540880 is an abundant number, since it is smaller than the sum of its proper divisors (172241520).

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

65540880 is a wasteful number, since it uses less digits than its factorization.

65540880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 65540880 is about 8095.7322090099. The cubic root of 65540880 is about 403.1847429034.

The spelling of 65540880 in words is "sixty-five million, five hundred forty thousand, eight hundred eighty".