61551360 has 288 divisors, whose sum is σ = 236940480. Its totient is φ = 15040512.

The previous prime is 61551323. The next prime is 61551401. The reversal of 61551360 is 6315516.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 449212 + ... + 449348.

It is an arithmetic number, because the mean of its divisors is an integer number (822710).

Almost surely, 2^61551360 is an apocalyptic number.

61551360 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 61551360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118470240).

61551360 is an abundant number, since it is smaller than the sum of its proper divisors (175389120).

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

61551360 is a wasteful number, since it uses less digits than its factorization.

61551360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 61551360 is about 7845.4674812913. The cubic root of 61551360 is about 394.8321885046.

Adding to 61551360 its reverse (6315516), we get a palindrome (67866876).

The spelling of 61551360 in words is "sixty-one million, five hundred fifty-one thousand, three hundred sixty".