61812030 has 64 divisors (see below), whose sum is σ = 173030400. Its totient is φ = 14126112.

The previous prime is 61812029. The next prime is 61812031. The reversal of 61812030 is 3021816.

It is an interprime number because it is at equal distance from previous prime (61812029) and next prime (61812031).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 61811988 and 61812006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61812031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7287 + ... + 13293.

It is an arithmetic number, because the mean of its divisors is an integer number (2703600).

Almost surely, 2^61812030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61812030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86515200).

61812030 is an abundant number, since it is smaller than the sum of its proper divisors (111218370).

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

61812030 is a wasteful number, since it uses less digits than its factorization.

61812030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6038 (or 6024 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 61812030 is about 7862.0627064403. The cubic root of 61812030 is about 395.3887749469.

Adding to 61812030 its reverse (3021816), we get a palindrome (64833846).

The spelling of 61812030 in words is "sixty-one million, eight hundred twelve thousand, thirty".