87990778515599 has 8 divisors (see below), whose sum is σ = 88070380097808. Its totient is φ = 87911195711040.

The previous prime is 87990778515589. The next prime is 87990778515697. The reversal of 87990778515599 is 99551587709978.

It is a Cunningham number, because it is equal to 9380340²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87990778515599 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 (87990778515509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4690169 + ... + 14070509.

It is an arithmetic number, because the mean of its divisors is an integer number (11008797512226).

Almost surely, 2^{87990778515599} is an apocalyptic number.

87990778515599 is a deficient number, since it is larger than the sum of its proper divisors (79601582209).

87990778515599 is a wasteful number, since it uses less digits than its factorization.

87990778515599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9388825.

The product of its (nonzero) digits is 18003384000, while the sum is 89.

The spelling of 87990778515599 in words is "eighty-seven trillion, nine hundred ninety billion, seven hundred seventy-eight million, five hundred fifteen thousand, five hundred ninety-nine".