77828260 has 24 divisors (see below), whose sum is σ = 163764216. Its totient is φ = 31069440.

The previous prime is 77828249. The next prime is 77828263. The reversal of 77828260 is 6282877.

It can be written as a sum of positive squares in 4 ways, for example, as 576 + 77827684 = 24^2 + 8822^2 .

It is not an unprimeable number, because it can be changed into a prime (77828263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7224 + ... + 14416.

It is an arithmetic number, because the mean of its divisors is an integer number (6823509).

Almost surely, 2^77828260 is an apocalyptic number.

It is an amenable number.

77828260 is an abundant number, since it is smaller than the sum of its proper divisors (85935956).

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

77828260 is a wasteful number, since it uses less digits than its factorization.

77828260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743 (or 7741 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 77828260 is about 8822.0326455982. The cubic root of 77828260 is about 426.9520538062.

The spelling of 77828260 in words is "seventy-seven million, eight hundred twenty-eight thousand, two hundred sixty".