61818120 has 512 divisors, whose sum is σ = 275788800. Its totient is φ = 11943936.

The previous prime is 61818109. The next prime is 61818121. The reversal of 61818120 is 2181816.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61818121) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1670742 + ... + 1670778.

It is an arithmetic number, because the mean of its divisors is an integer number (538650).

Almost surely, 2^61818120 is an apocalyptic number.

61818120 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 61818120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137894400).

61818120 is an abundant number, since it is smaller than the sum of its proper divisors (213970680).

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

61818120 is a wasteful number, since it uses less digits than its factorization.

61818120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 61818120 is about 7862.4499998410. The cubic root of 61818120 is about 395.4017596823.

Adding to 61818120 its reverse (2181816), we get a palindrome (63999936).

The spelling of 61818120 in words is "sixty-one million, eight hundred eighteen thousand, one hundred twenty".