785977779588 has 12 divisors (see below), whose sum is σ = 1833948152400. Its totient is φ = 261992593192.

The previous prime is 785977779581. The next prime is 785977779589. The reversal of 785977779588 is 885977779587.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×785977779588² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (785977779581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32749074138 + ... + 32749074161.

It is an arithmetic number, because the mean of its divisors is an integer number (152829012700).

Almost surely, 2^785977779588 is an apocalyptic number.

It is an amenable number.

785977779588 is an abundant number, since it is smaller than the sum of its proper divisors (1047970372812).

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

785977779588 is a wasteful number, since it uses less digits than its factorization.

785977779588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65498148306 (or 65498148304 counting only the distinct ones).

The product of its digits is 17425497600, while the sum is 87.

Subtracting 785977779588 from its reverse (885977779587), we obtain a palindrome (99999999999).

It can be divided in two parts, 785977 and 779588, that added together give a triangular number (1565565 = T₁₇₆₉).

The spelling of 785977779588 in words is "seven hundred eighty-five billion, nine hundred seventy-seven million, seven hundred seventy-nine thousand, five hundred eighty-eight".