77388857 has 8 divisors (see below), whose sum is σ = 95247936. Its totient is φ = 61230672.

The previous prime is 77388821. The next prime is 77388959. The reversal of 77388857 is 75888377.

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 77388857 - 2⁸ = 77388601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77388799 and 77388808.

It is not an unprimeable number, because it can be changed into a prime (77388257) 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, 425123 + ... + 425304.

It is an arithmetic number, because the mean of its divisors is an integer number (11905992).

Almost surely, 2^77388857 is an apocalyptic number.

It is an amenable number.

77388857 is a deficient number, since it is larger than the sum of its proper divisors (17859079).

77388857 is a wasteful number, since it uses less digits than its factorization.

77388857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850447.

The product of its digits is 2634240, while the sum is 53.

The square root of 77388857 is about 8797.0936677973. The cubic root of 77388857 is about 426.1470412341.

The spelling of 77388857 in words is "seventy-seven million, three hundred eighty-eight thousand, eight hundred fifty-seven".