77520152440 has 32 divisors (see below), whose sum is σ = 174435839280. Its totient is φ = 31005306112.

The previous prime is 77520152419. The next prime is 77520152477. The reversal of 77520152440 is 4425102577.

It is a self number, because there is not a number n which added to its sum of digits gives 77520152440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404244 + ... + 564316.

Almost surely, 2^77520152440 is an apocalyptic number.

It is an amenable number.

77520152440 is an abundant number, since it is smaller than the sum of its proper divisors (96915686840).

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

77520152440 is a wasteful number, since it uses less digits than its factorization.

77520152440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172191 (or 172187 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 37.

The spelling of 77520152440 in words is "seventy-seven billion, five hundred twenty million, one hundred fifty-two thousand, four hundred forty".