87239730697 has 4 divisors (see below), whose sum is σ = 99702549376. Its totient is φ = 74776912020.

The previous prime is 87239730679. The next prime is 87239730713. The reversal of 87239730697 is 79603793278.

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 a de Polignac number, because none of the positive numbers 2^k-87239730697 is a prime.

It is a super-4 number, since 4×87239730697⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87239730647) 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, 6231409329 + ... + 6231409342.

It is an arithmetic number, because the mean of its divisors is an integer number (24925637344).

Almost surely, 2^87239730697 is an apocalyptic number.

It is an amenable number.

87239730697 is a deficient number, since it is larger than the sum of its proper divisors (12462818679).

87239730697 is a wasteful number, since it uses less digits than its factorization.

87239730697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12462818678.

The product of its (nonzero) digits is 24004512, while the sum is 61.

The spelling of 87239730697 in words is "eighty-seven billion, two hundred thirty-nine million, seven hundred thirty thousand, six hundred ninety-seven".