61118520 has 64 divisors (see below), whose sum is σ = 185893920. Its totient is φ = 16072704.

The previous prime is 61118509. The next prime is 61118527. The reversal of 61118520 is 2581116.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61118527) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5272 + ... + 12248.

Almost surely, 2^61118520 is an apocalyptic number.

61118520 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 61118520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92946960).

61118520 is an abundant number, since it is smaller than the sum of its proper divisors (124775400).

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

61118520 is a wasteful number, since it uses less digits than its factorization.

61118520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7064 (or 7060 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 61118520 is about 7817.8334594694. The cubic root of 61118520 is about 393.9045007191.

Adding to 61118520 its reverse (2581116), we get a palindrome (63699636).

The spelling of 61118520 in words is "sixty-one million, one hundred eighteen thousand, five hundred twenty".