77125220 has 12 divisors (see below), whose sum is σ = 161963004. Its totient is φ = 30850080.

The previous prime is 77125211. The next prime is 77125247. The reversal of 77125220 is 2252177.

It can be written as a sum of positive squares in 2 ways, for example, as 13380964 + 63744256 = 3658^2 + 7984^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77125220.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1928111 + ... + 1928150.

It is an arithmetic number, because the mean of its divisors is an integer number (13496917).

Almost surely, 2^77125220 is an apocalyptic number.

It is an amenable number.

77125220 is an abundant number, since it is smaller than the sum of its proper divisors (84837784).

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

77125220 is a wasteful number, since it uses less digits than its factorization.

77125220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856270 (or 3856268 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 77125220 is about 8782.0965606169. The cubic root of 77125220 is about 425.6625789532.

Adding to 77125220 its reverse (2252177), we get a palindrome (79377397).

The spelling of 77125220 in words is "seventy-seven million, one hundred twenty-five thousand, two hundred twenty".