84078551428686 has 24 divisors (see below), whose sum is σ = 182170363396944. Its totient is φ = 28026157865760.

The previous prime is 84078551428601. The next prime is 84078551428693. The reversal of 84078551428686 is 68682415587048.

It is a happy number.

84078551428686 is a `hidden beast` number, since 8 + 4 + 0 + 7 + 8 + 5 + 514 + 28 + 6 + 86 = 666.

It is a super-2 number, since 2×84078551428686² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36797370 + ... + 39015426.

It is an arithmetic number, because the mean of its divisors is an integer number (7590431808206).

Almost surely, 2^{84078551428686} is an apocalyptic number.

84078551428686 is an abundant number, since it is smaller than the sum of its proper divisors (98091811968258).

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

84078551428686 is a wasteful number, since it uses less digits than its factorization.

84078551428686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323976 (or 4323973 counting only the distinct ones).

The product of its (nonzero) digits is 825753600, while the sum is 72.

The spelling of 84078551428686 in words is "eighty-four trillion, seventy-eight billion, five hundred fifty-one million, four hundred twenty-eight thousand, six hundred eighty-six".