84784778617 has 16 divisors (see below), whose sum is σ = 105829702272. Its totient is φ = 65988558720.

The previous prime is 84784778597. The next prime is 84784778627. The reversal of 84784778617 is 71687748748.

It is not a de Polignac number, because 84784778617 - 2⁷ = 84784778489 is a prime.

It is a super-3 number, since 3×84784778617³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (84784778627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579748 + ... + 711109.

It is an arithmetic number, because the mean of its divisors is an integer number (6614356392).

Almost surely, 2^84784778617 is an apocalyptic number.

It is an amenable number.

84784778617 is a deficient number, since it is larger than the sum of its proper divisors (21044923655).

84784778617 is a wasteful number, since it uses less digits than its factorization.

84784778617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291728.

The product of its digits is 118013952, while the sum is 67.

The spelling of 84784778617 in words is "eighty-four billion, seven hundred eighty-four million, seven hundred seventy-eight thousand, six hundred seventeen".