87561939629 has 4 divisors (see below), whose sum is σ = 87575215200. Its totient is φ = 87548664060.

The previous prime is 87561939587. The next prime is 87561939667. The reversal of 87561939629 is 92693916578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87561939629 - 2¹⁶ = 87561874093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87561939229) 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, 6627887 + ... + 6641084.

It is an arithmetic number, because the mean of its divisors is an integer number (21893803800).

Almost surely, 2^87561939629 is an apocalyptic number.

It is an amenable number.

87561939629 is a deficient number, since it is larger than the sum of its proper divisors (13275571).

87561939629 is a wasteful number, since it uses less digits than its factorization.

87561939629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13275570.

The product of its digits is 44089920, while the sum is 65.

The spelling of 87561939629 in words is "eighty-seven billion, five hundred sixty-one million, nine hundred thirty-nine thousand, six hundred twenty-nine".