61800102 has 96 divisors (see below), whose sum is σ = 170614080. Its totient is φ = 15724800.

The previous prime is 61800077. The next prime is 61800107. The reversal of 61800102 is 20100816.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61800107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46852 + ... + 48152.

It is an arithmetic number, because the mean of its divisors is an integer number (1777230).

Almost surely, 2^61800102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61800102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85307040).

61800102 is an abundant number, since it is smaller than the sum of its proper divisors (108813978).

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

61800102 is a wasteful number, since it uses less digits than its factorization.

61800102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 61800102 is about 7861.3040902893. The cubic root of 61800102 is about 395.3633403041.

Adding to 61800102 its reverse (20100816), we get a palindrome (81900918).

The spelling of 61800102 in words is "sixty-one million, eight hundred thousand, one hundred two".