87790905819 has 6 divisors (see below), whose sum is σ = 126809086196. Its totient is φ = 58527270540.

The previous prime is 87790905757. The next prime is 87790905833. The reversal of 87790905819 is 91850909778.

It is not a de Polignac number, because 87790905819 - 2²⁵ = 87757351387 is a prime.

It is a super-2 number, since 2×87790905819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87790905859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4877272537 + ... + 4877272554.

Almost surely, 2^87790905819 is an apocalyptic number.

87790905819 is a deficient number, since it is larger than the sum of its proper divisors (39018180377).

87790905819 is a wasteful number, since it uses less digits than its factorization.

87790905819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9754545097 (or 9754545094 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 63.

The spelling of 87790905819 in words is "eighty-seven billion, seven hundred ninety million, nine hundred five thousand, eight hundred nineteen".