61687870086 has 32 divisors (see below), whose sum is σ = 127644860160. Its totient is φ = 19851267744.

The previous prime is 61687870067. The next prime is 61687870087. The reversal of 61687870086 is 68007878616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61687870087) 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 15 ways as a sum of consecutive naturals, for example, 2133321 + ... + 2162043.

It is an arithmetic number, because the mean of its divisors is an integer number (3988901880).

Almost surely, 2^61687870086 is an apocalyptic number.

61687870086 is an abundant number, since it is smaller than the sum of its proper divisors (65956990074).

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

61687870086 is a wasteful number, since it uses less digits than its factorization.

61687870086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41100.

The product of its (nonzero) digits is 5419008, while the sum is 57.

The spelling of 61687870086 in words is "sixty-one billion, six hundred eighty-seven million, eight hundred seventy thousand, eighty-six".