61890344136 has 64 divisors (see below), whose sum is σ = 171943526400. Its totient is φ = 20627006400.

The previous prime is 61890344123. The next prime is 61890344137. The reversal of 61890344136 is 63144309816.

It is a junction number, because it is equal to n+sod(n) for n = 61890344091 and 61890344100.

It is not an unprimeable number, because it can be changed into a prime (61890344137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1751766 + ... + 1786746.

It is an arithmetic number, because the mean of its divisors is an integer number (2686617600).

Almost surely, 2^61890344136 is an apocalyptic number.

It is an amenable number.

61890344136 is an abundant number, since it is smaller than the sum of its proper divisors (110053182264).

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

61890344136 is a wasteful number, since it uses less digits than its factorization.

61890344136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43187 (or 43177 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 61890344136 in words is "sixty-one billion, eight hundred ninety million, three hundred forty-four thousand, one hundred thirty-six".