77444980 has 12 divisors (see below), whose sum is σ = 162634500. Its totient is φ = 30977984.

The previous prime is 77444977. The next prime is 77444987. The reversal of 77444980 is 8944477.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13380964 + 64064016 = 3658^2 + 8004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77444987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1936105 + ... + 1936144.

It is an arithmetic number, because the mean of its divisors is an integer number (13552875).

Almost surely, 2^77444980 is an apocalyptic number.

It is an amenable number.

77444980 is an abundant number, since it is smaller than the sum of its proper divisors (85189520).

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

77444980 is a wasteful number, since it uses less digits than its factorization.

77444980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872258 (or 3872256 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 77444980 is about 8800.2829499966. The cubic root of 77444980 is about 426.2500313895.

It can be divided in two parts, 774 and 44980, that added together give a palindrome (45754).

The spelling of 77444980 in words is "seventy-seven million, four hundred forty-four thousand, nine hundred eighty".