87720659597 has 4 divisors (see below), whose sum is σ = 87723554016. Its totient is φ = 87717765180.

The previous prime is 87720659513. The next prime is 87720659627. The reversal of 87720659597 is 79595602778.

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 87720659597 - 2¹² = 87720655501 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 (87720959597) 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, 1401263 + ... + 1462524.

It is an arithmetic number, because the mean of its divisors is an integer number (21930888504).

Almost surely, 2^87720659597 is an apocalyptic number.

It is an amenable number.

87720659597 is a deficient number, since it is larger than the sum of its proper divisors (2894419).

87720659597 is a wasteful number, since it uses less digits than its factorization.

87720659597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894418.

The product of its (nonzero) digits is 66679200, while the sum is 65.

The spelling of 87720659597 in words is "eighty-seven billion, seven hundred twenty million, six hundred fifty-nine thousand, five hundred ninety-seven".