77907489738 has 32 divisors (see below), whose sum is σ = 177671382336. Its totient is φ = 22561444608.

The previous prime is 77907489719. The next prime is 77907489763. The reversal of 77907489738 is 83798470977.

It is a super-4 number, since 4×77907489738⁴ (a number of 45 digits) contains 4444 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29375556 + ... + 29378207.

It is an arithmetic number, because the mean of its divisors is an integer number (5552230698).

Almost surely, 2^77907489738 is an apocalyptic number.

77907489738 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

77907489738 is an abundant number, since it is smaller than the sum of its proper divisors (99763892598).

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

77907489738 is a wasteful number, since it uses less digits than its factorization.

77907489738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58753798.

The product of its (nonzero) digits is 149361408, while the sum is 69.

It can be divided in two parts, 77907 and 489738, that added together give a triangular number (567645 = T₁₀₆₅).

The spelling of 77907489738 in words is "seventy-seven billion, nine hundred seven million, four hundred eighty-nine thousand, seven hundred thirty-eight".