77770125 has 40 divisors (see below), whose sum is σ = 145005432. Its totient is φ = 41472000.

The previous prime is 77770117. The next prime is 77770129. The reversal of 77770125 is 52107777.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 927369 + 76842756 = 963^2 + 8766^2 .

It is not a de Polignac number, because 77770125 - 2³ = 77770117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77770125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77770129) 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 39 ways as a sum of consecutive naturals, for example, 6285 + ... + 13965.

Almost surely, 2^77770125 is an apocalyptic number.

77770125 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77770125 is a deficient number, since it is larger than the sum of its proper divisors (67235307).

77770125 is an equidigital number, since it uses as much as digits as its factorization.

77770125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7708 (or 7689 counting only the distinct ones).

The product of its (nonzero) digits is 24010, while the sum is 36.

The square root of 77770125 is about 8818.7371544910. The cubic root of 77770125 is about 426.8457212208.

The spelling of 77770125 in words is "seventy-seven million, seven hundred seventy thousand, one hundred twenty-five".