77720010 has 64 divisors (see below), whose sum is σ = 192689280. Its totient is φ = 20049920.

The previous prime is 77720003. The next prime is 77720011. The reversal of 77720010 is 1002777.

It is not an unprimeable number, because it can be changed into a prime (77720011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219994 + ... + 220346.

It is an arithmetic number, because the mean of its divisors is an integer number (3010770).

Almost surely, 2^77720010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77720010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96344640).

77720010 is an abundant number, since it is smaller than the sum of its proper divisors (114969270).

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

77720010 is a wasteful number, since it uses less digits than its factorization.

77720010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583.

The product of its (nonzero) digits is 686, while the sum is 24.

The square root of 77720010 is about 8815.8953033711. The cubic root of 77720010 is about 426.7540151840.

Adding to 77720010 its reverse (1002777), we get a palindrome (78722787).

The spelling of 77720010 in words is "seventy-seven million, seven hundred twenty thousand, ten".