61031680 has 36 divisors (see below), whose sum is σ = 146193012. Its totient is φ = 24412160.

The previous prime is 61031669. The next prime is 61031699. The reversal of 61031680 is 8613016.

It can be written as a sum of positive squares in 2 ways, for example, as 16516096 + 44515584 = 4064^2 + 6672^2 .

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, 22561 + ... + 25120.

It is an arithmetic number, because the mean of its divisors is an integer number (4060917).

Almost surely, 2^61031680 is an apocalyptic number.

It is an amenable number.

61031680 is an abundant number, since it is smaller than the sum of its proper divisors (85161332).

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

61031680 is an equidigital number, since it uses as much as digits as its factorization.

61031680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47702 (or 47688 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 61031680 is about 7812.2775168321. The cubic root of 61031680 is about 393.7178530906.

Adding to 61031680 its reverse (8613016), we get a palindrome (69644696).

The spelling of 61031680 in words is "sixty-one million, thirty-one thousand, six hundred eighty".