77704020 has 72 divisors (see below), whose sum is σ = 241473960. Its totient is φ = 20213760.

The previous prime is 77704009. The next prime is 77704027. The reversal of 77704020 is 2040777.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3261636 + 74442384 = 1806^2 + 8628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77704027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2116 + ... + 12644.

It is an arithmetic number, because the mean of its divisors is an integer number (3353805).

Almost surely, 2^77704020 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 77704020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120736980).

77704020 is an abundant number, since it is smaller than the sum of its proper divisors (163769940).

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

77704020 is a wasteful number, since it uses less digits than its factorization.

77704020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10585 (or 10580 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 77704020 is about 8814.9883720854. The cubic root of 77704020 is about 426.7247465966.

Adding to 77704020 its reverse (2040777), we get a palindrome (79744797).

The spelling of 77704020 in words is "seventy-seven million, seven hundred four thousand, twenty".