61890643060 has 24 divisors (see below), whose sum is σ = 130453522920. Its totient is φ = 24664224384.

The previous prime is 61890643049. The next prime is 61890643063. The reversal of 61890643060 is 6034609816.

It can be written as a sum of positive squares in 4 ways, for example, as 503643364 + 61386999696 = 22442^2 + 247764^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61890642998 and 61890643016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61890643063) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5746539 + ... + 5757298.

It is an arithmetic number, because the mean of its divisors is an integer number (5435563455).

Almost surely, 2^61890643060 is an apocalyptic number.

It is an amenable number.

61890643060 is an abundant number, since it is smaller than the sum of its proper divisors (68562879860).

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

61890643060 is a wasteful number, since it uses less digits than its factorization.

61890643060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11504115 (or 11504113 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 61890643060 in words is "sixty-one billion, eight hundred ninety million, six hundred forty-three thousand, sixty".