87798691563 has 32 divisors (see below), whose sum is σ = 129316642560. Its totient is φ = 52541427840.

The previous prime is 87798691559. The next prime is 87798691601. The reversal of 87798691563 is 36519689778.

It is not a de Polignac number, because 87798691563 - 2² = 87798691559 is a prime.

It is a super-2 number, since 2×87798691563² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87798691063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5659245 + ... + 5674737.

It is an arithmetic number, because the mean of its divisors is an integer number (4041145080).

Almost surely, 2^87798691563 is an apocalyptic number.

87798691563 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

87798691563 is a deficient number, since it is larger than the sum of its proper divisors (41517950997).

87798691563 is a wasteful number, since it uses less digits than its factorization.

87798691563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17659.

The product of its digits is 137168640, while the sum is 69.

The spelling of 87798691563 in words is "eighty-seven billion, seven hundred ninety-eight million, six hundred ninety-one thousand, five hundred sixty-three".