61020031320 has 384 divisors, whose sum is σ = 217599782400. Its totient is φ = 15347211264.

The previous prime is 61020031313. The next prime is 61020031337. The reversal of 61020031320 is 2313002016.

61020031320 is a `hidden beast` number, since 610 + 2 + 0 + 0 + 31 + 3 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 61020031293 and 61020031302.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 16318011 + ... + 16321749.

It is an arithmetic number, because the mean of its divisors is an integer number (566666100).

Almost surely, 2^61020031320 is an apocalyptic number.

61020031320 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 61020031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108799891200).

61020031320 is an abundant number, since it is smaller than the sum of its proper divisors (156579751080).

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

61020031320 is a wasteful number, since it uses less digits than its factorization.

61020031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861 (or 3845 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 61020031320 its reverse (2313002016), we get a palindrome (63333033336).

The spelling of 61020031320 in words is "sixty-one billion, twenty million, thirty-one thousand, three hundred twenty".