77020308 has 84 divisors (see below), whose sum is σ = 205873108. Its totient is φ = 25194240.

The previous prime is 77020301. The next prime is 77020309. The reversal of 77020308 is 80302077.

It can be written as a sum of positive squares in 2 ways, for example, as 5143824 + 71876484 = 2268^2 + 8478^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77020301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 177660 + ... + 178092.

Almost surely, 2^77020308 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 77020308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102936554).

77020308 is an abundant number, since it is smaller than the sum of its proper divisors (128852800).

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

77020308 is a wasteful number, since it uses less digits than its factorization.

77020308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 77020308 is about 8776.1214667984. The cubic root of 77020308 is about 425.4694844136.

The spelling of 77020308 in words is "seventy-seven million, twenty thousand, three hundred eight".