77894457888 has 144 divisors (see below), whose sum is σ = 228555323136. Its totient is φ = 23194229760.

The previous prime is 77894457853. The next prime is 77894457889. The reversal of 77894457888 is 88875449877.

It is not an unprimeable number, because it can be changed into a prime (77894457889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 425506 + ... + 580382.

It is an arithmetic number, because the mean of its divisors is an integer number (1587189744).

Almost surely, 2^77894457888 is an apocalyptic number.

77894457888 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77894457888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114277661568).

77894457888 is an abundant number, since it is smaller than the sum of its proper divisors (150660865248).

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

77894457888 is a wasteful number, since it uses less digits than its factorization.

77894457888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154947 (or 154926 counting only the distinct ones).

The product of its digits is 1011548160, while the sum is 75.

The spelling of 77894457888 in words is "seventy-seven billion, eight hundred ninety-four million, four hundred fifty-seven thousand, eight hundred eighty-eight".