77820630 has 32 divisors (see below), whose sum is σ = 193212000. Its totient is φ = 20036352.

The previous prime is 77820629. The next prime is 77820641. The reversal of 77820630 is 3602877.

It is a junction number, because it is equal to n+sod(n) for n = 77820591 and 77820600.

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, 43855 + ... + 45594.

It is an arithmetic number, because the mean of its divisors is an integer number (6037875).

Almost surely, 2^77820630 is an apocalyptic number.

77820630 is an abundant number, since it is smaller than the sum of its proper divisors (115391370).

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

77820630 is a wasteful number, since it uses less digits than its factorization.

77820630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89488.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 77820630 is about 8821.6001949760. The cubic root of 77820630 is about 426.9381010739.

The spelling of 77820630 in words is "seventy-seven million, eight hundred twenty thousand, six hundred thirty".