77881248 has 36 divisors (see below), whose sum is σ = 221475618. Its totient is φ = 25960320.

The previous prime is 77881241. The next prime is 77881273. The reversal of 77881248 is 84218877.

It can be written as a sum of positive squares in only one way, i.e., 64834704 + 13046544 = 8052^2 + 3612^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (77881241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 134923 + ... + 135498.

Almost surely, 2^77881248 is an apocalyptic number.

It is an amenable number.

77881248 is an abundant number, since it is smaller than the sum of its proper divisors (143594370).

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

77881248 is a wasteful number, since it uses less digits than its factorization.

77881248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270437 (or 270426 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 77881248 is about 8825.0352973798. The cubic root of 77881248 is about 427.0489260869.

The spelling of 77881248 in words is "seventy-seven million, eight hundred eighty-one thousand, two hundred forty-eight".