61281227670 has 64 divisors (see below), whose sum is σ = 158603477760. Its totient is φ = 15064126848.

The previous prime is 61281227639. The next prime is 61281227677. The reversal of 61281227670 is 7672218216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61281227677) 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 31 ways as a sum of consecutive naturals, for example, 181897 + ... + 394523.

It is an arithmetic number, because the mean of its divisors is an integer number (2478179340).

Almost surely, 2^61281227670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61281227670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79301738880).

61281227670 is an abundant number, since it is smaller than the sum of its proper divisors (97322250090).

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

61281227670 is a wasteful number, since it uses less digits than its factorization.

61281227670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213389.

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 61281227670 in words is "sixty-one billion, two hundred eighty-one million, two hundred twenty-seven thousand, six hundred seventy".