87215378771678 has 16 divisors (see below), whose sum is σ = 140866314669360. Its totient is φ = 40346895063936.

The previous prime is 87215378771531. The next prime is 87215378771707. The reversal of 87215378771678 is 87617787351278.

It is a junction number, because it is equal to n+sod(n) for n = 87215378771599 and 87215378771608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21738626801 + ... + 21738630812.

It is an arithmetic number, because the mean of its divisors is an integer number (8804144666835).

Almost surely, 2^{87215378771678} is an apocalyptic number.

87215378771678 is a deficient number, since it is larger than the sum of its proper divisors (53650935897682).

87215378771678 is a wasteful number, since it uses less digits than its factorization.

87215378771678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43477257691.

The product of its digits is 1548933120, while the sum is 77.

The spelling of 87215378771678 in words is "eighty-seven trillion, two hundred fifteen billion, three hundred seventy-eight million, seven hundred seventy-one thousand, six hundred seventy-eight".