77700020 has 12 divisors (see below), whose sum is σ = 163170084. Its totient is φ = 31080000.

The previous prime is 77700001. The next prime is 77700023. The reversal of 77700020 is 2000777.

It can be written as a sum of positive squares in 2 ways, for example, as 40806544 + 36893476 = 6388^2 + 6074^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77700023) 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 3 ways as a sum of consecutive naturals, for example, 1942481 + ... + 1942520.

It is an arithmetic number, because the mean of its divisors is an integer number (13597507).

Almost surely, 2^77700020 is an apocalyptic number.

It is an amenable number.

77700020 is an abundant number, since it is smaller than the sum of its proper divisors (85470064).

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

77700020 is a wasteful number, since it uses less digits than its factorization.

77700020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885010 (or 3885008 counting only the distinct ones).

The product of its (nonzero) digits is 686, while the sum is 23.

The square root of 77700020 is about 8814.7614828763. The cubic root of 77700020 is about 426.7174242458.

Adding to 77700020 its reverse (2000777), we get a palindrome (79700797).

The spelling of 77700020 in words is "seventy-seven million, seven hundred thousand, twenty".