61818012 has 48 divisors (see below), whose sum is σ = 161566720. Its totient is φ = 20439216.

The previous prime is 61818011. The next prime is 61818059. The reversal of 61818012 is 21081816.

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 (61818011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11463 + ... + 15969.

Almost surely, 2^61818012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61818012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80783360).

61818012 is an abundant number, since it is smaller than the sum of its proper divisors (99748708).

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

61818012 is a wasteful number, since it uses less digits than its factorization.

61818012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647 (or 4639 counting only the distinct ones).

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

The square root of 61818012 is about 7862.4431317498. The cubic root of 61818012 is about 395.4015294186.

Adding to 61818012 its reverse (21081816), we get a palindrome (82899828).

The spelling of 61818012 in words is "sixty-one million, eight hundred eighteen thousand, twelve".