65555490 has 256 divisors, whose sum is σ = 220631040. Its totient is φ = 12026880.

The previous prime is 65555489. The next prime is 65555537. The reversal of 65555490 is 9455556.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 1111081 + ... + 1111139.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^65555490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65555490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110315520).

65555490 is an abundant number, since it is smaller than the sum of its proper divisors (155075550).

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

65555490 is a wasteful number, since it uses less digits than its factorization.

65555490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 65555490 is about 8096.6344860071. The cubic root of 65555490 is about 403.2146992271.

It can be divided in two parts, 65 and 555490, that added together give a palindrome (555555).

The spelling of 65555490 in words is "sixty-five million, five hundred fifty-five thousand, four hundred ninety".