77404020 has 48 divisors (see below), whose sum is σ = 217125888. Its totient is φ = 20603520.

The previous prime is 77404013. The next prime is 77404021. The reversal of 77404020 is 2040477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77404021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51885 + ... + 53355.

It is an arithmetic number, because the mean of its divisors is an integer number (4523456).

Almost surely, 2^77404020 is an apocalyptic number.

It is an amenable number.

77404020 is an abundant number, since it is smaller than the sum of its proper divisors (139721868).

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

77404020 is a wasteful number, since it uses less digits than its factorization.

77404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360 (or 2358 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 24.

The square root of 77404020 is about 8797.9554443064. The cubic root of 77404020 is about 426.1748714493.

Adding to 77404020 its reverse (2040477), we get a palindrome (79444497).

The spelling of 77404020 in words is "seventy-seven million, four hundred four thousand, twenty".