61306620 has 24 divisors (see below), whose sum is σ = 171658704. Its totient is φ = 16348416.

The previous prime is 61306577. The next prime is 61306627. The reversal of 61306620 is 2660316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61306627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510829 + ... + 510948.

It is an arithmetic number, because the mean of its divisors is an integer number (7152446).

Almost surely, 2^61306620 is an apocalyptic number.

61306620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61306620 is an abundant number, since it is smaller than the sum of its proper divisors (110352084).

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

61306620 is a wasteful number, since it uses less digits than its factorization.

61306620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021789 (or 1021787 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 61306620 is about 7829.8544047766. The cubic root of 61306620 is about 394.3081838997.

Adding to 61306620 its reverse (2660316), we get a palindrome (63966936).

The spelling of 61306620 in words is "sixty-one million, three hundred six thousand, six hundred twenty".