61872015684 has 12 divisors (see below), whose sum is σ = 144368036624. Its totient is φ = 20624005224.

The previous prime is 61872015683. The next prime is 61872015727. The reversal of 61872015684 is 48651027816.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×61872015684² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61872015683) 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 3 ways as a sum of consecutive naturals, for example, 2578000642 + ... + 2578000665.

Almost surely, 2^61872015684 is an apocalyptic number.

It is an amenable number.

61872015684 is an abundant number, since it is smaller than the sum of its proper divisors (82496020940).

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

61872015684 is a wasteful number, since it uses less digits than its factorization.

61872015684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156001314 (or 5156001312 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 61872015684 in words is "sixty-one billion, eight hundred seventy-two million, fifteen thousand, six hundred eighty-four".