78770186586 has 256 divisors, whose sum is σ = 227404800000. Its totient is φ = 19626872832.

The previous prime is 78770186531. The next prime is 78770186603. The reversal of 78770186586 is 68568107787.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 41920395 + ... + 41922273.

It is an arithmetic number, because the mean of its divisors is an integer number (888300000).

Almost surely, 2^78770186586 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78770186586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113702400000).

78770186586 is an abundant number, since it is smaller than the sum of its proper divisors (148634613414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78770186586 is a wasteful number, since it uses less digits than its factorization.

78770186586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2372 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

It can be divided in two parts, 78770 and 186586, that added together give a triangular number (265356 = T₇₂₈).

The spelling of 78770186586 in words is "seventy-eight billion, seven hundred seventy million, one hundred eighty-six thousand, five hundred eighty-six".