77425820 has 48 divisors (see below), whose sum is σ = 179661888. Its totient is φ = 27878400.

The previous prime is 77425819. The next prime is 77425849. The reversal of 77425820 is 2852477.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2870 + ... + 12770.

It is an arithmetic number, because the mean of its divisors is an integer number (3742956).

Almost surely, 2^77425820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77425820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89830944).

77425820 is an abundant number, since it is smaller than the sum of its proper divisors (102236068).

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

77425820 is a wasteful number, since it uses less digits than its factorization.

77425820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9950 (or 9948 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 77425820 is about 8799.1942812964. The cubic root of 77425820 is about 426.2148768656.

The spelling of 77425820 in words is "seventy-seven million, four hundred twenty-five thousand, eight hundred twenty".