77825915020 has 72 divisors (see below), whose sum is σ = 190329377616. Its totient is φ = 26653447296.

The previous prime is 77825915003. The next prime is 77825915071. The reversal of 77825915020 is 2051952877.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 845082 + ... + 932638.

It is an arithmetic number, because the mean of its divisors is an integer number (2643463578).

Almost surely, 2^77825915020 is an apocalyptic number.

77825915020 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 77825915020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95164688808).

77825915020 is an abundant number, since it is smaller than the sum of its proper divisors (112503462596).

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

77825915020 is a wasteful number, since it uses less digits than its factorization.

77825915020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88487 (or 88478 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 77825915020 in words is "seventy-seven billion, eight hundred twenty-five million, nine hundred fifteen thousand, twenty".