77725557140 has 144 divisors (see below), whose sum is σ = 207496598400. Its totient is φ = 24183694080.

The previous prime is 77725557131. The next prime is 77725557179. The reversal of 77725557140 is 4175552777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6451202 + ... + 6463238.

It is an arithmetic number, because the mean of its divisors is an integer number (1440948600).

Almost surely, 2^77725557140 is an apocalyptic number.

77725557140 is a gapful number since it is divisible by the number (70) 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 77725557140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103748299200).

77725557140 is an abundant number, since it is smaller than the sum of its proper divisors (129771041260).

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

77725557140 is a wasteful number, since it uses less digits than its factorization.

77725557140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12670 (or 12661 counting only the distinct ones).

The product of its (nonzero) digits is 2401000, while the sum is 50.

The spelling of 77725557140 in words is "seventy-seven billion, seven hundred twenty-five million, five hundred fifty-seven thousand, one hundred forty".