77142925 has 6 divisors (see below), whose sum is σ = 95657258. Its totient is φ = 61714320.

The previous prime is 77142899. The next prime is 77142937. The reversal of 77142925 is 52924177.

It can be written as a sum of positive squares in 3 ways, for example, as 16630084 + 60512841 = 4078^2 + 7779^2 .

It is not a de Polignac number, because 77142925 - 2²³ = 68754317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1542834 + ... + 1542883.

Almost surely, 2^77142925 is an apocalyptic number.

It is an amenable number.

77142925 is a deficient number, since it is larger than the sum of its proper divisors (18514333).

77142925 is a wasteful number, since it uses less digits than its factorization.

77142925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3085727 (or 3085722 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The square root of 77142925 is about 8783.1045194737. The cubic root of 77142925 is about 425.6951484091.

The spelling of 77142925 in words is "seventy-seven million, one hundred forty-two thousand, nine hundred twenty-five".