77725857 has 8 divisors (see below), whose sum is σ = 113055840. Its totient is φ = 47106560.

The previous prime is 77725849. The next prime is 77725861. The reversal of 77725857 is 75852777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77725857 - 2³ = 77725849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77725847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177632 + ... + 1177697.

It is an arithmetic number, because the mean of its divisors is an integer number (14131980).

Almost surely, 2^77725857 is an apocalyptic number.

It is an amenable number.

77725857 is a deficient number, since it is larger than the sum of its proper divisors (35329983).

77725857 is a wasteful number, since it uses less digits than its factorization.

77725857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355343.

The product of its digits is 960400, while the sum is 48.

The square root of 77725857 is about 8816.2269140489. The cubic root of 77725857 is about 426.7647167102.

Subtracting from 77725857 its reverse (75852777), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 77725857 in words is "seventy-seven million, seven hundred twenty-five thousand, eight hundred fifty-seven".