77544420 has 48 divisors (see below), whose sum is σ = 220694208. Its totient is φ = 20338560.

The previous prime is 77544413. The next prime is 77544421. The reversal of 77544420 is 2444577.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77544421) 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, 6934 + ... + 14253.

It is an arithmetic number, because the mean of its divisors is an integer number (4597796).

Almost surely, 2^77544420 is an apocalyptic number.

It is an amenable number.

77544420 is an abundant number, since it is smaller than the sum of its proper divisors (143149788).

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

77544420 is a wasteful number, since it uses less digits than its factorization.

77544420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21260 (or 21258 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 33.

The square root of 77544420 is about 8805.9309558956. The cubic root of 77544420 is about 426.4323895600.

Adding to 77544420 its reverse (2444577), we get a palindrome (79988997).

The spelling of 77544420 in words is "seventy-seven million, five hundred forty-four thousand, four hundred twenty".