61013620 has 12 divisors (see below), whose sum is σ = 128128644. Its totient is φ = 24405440.

The previous prime is 61013609. The next prime is 61013639. The reversal of 61013620 is 2631016.

It can be written as a sum of positive squares in 2 ways, for example, as 44675856 + 16337764 = 6684^2 + 4042^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1525321 + ... + 1525360.

It is an arithmetic number, because the mean of its divisors is an integer number (10677387).

Almost surely, 2^61013620 is an apocalyptic number.

It is an amenable number.

61013620 is an abundant number, since it is smaller than the sum of its proper divisors (67115024).

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

61013620 is a wasteful number, since it uses less digits than its factorization.

61013620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050690 (or 3050688 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 61013620 is about 7811.1215583935. The cubic root of 61013620 is about 393.6790139942.

Adding to 61013620 its reverse (2631016), we get a palindrome (63644636).

The spelling of 61013620 in words is "sixty-one million, thirteen thousand, six hundred twenty".