77967857 has 4 divisors (see below), whose sum is σ = 85055856. Its totient is φ = 70879860.

The previous prime is 77967839. The next prime is 77967881. The reversal of 77967857 is 75876977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77967857 - 2¹⁸ = 77705713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77967157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3543983 + ... + 3544004.

It is an arithmetic number, because the mean of its divisors is an integer number (21263964).

Almost surely, 2^77967857 is an apocalyptic number.

It is an amenable number.

77967857 is a deficient number, since it is larger than the sum of its proper divisors (7087999).

77967857 is a wasteful number, since it uses less digits than its factorization.

77967857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7087998.

The product of its digits is 5186160, while the sum is 56.

The square root of 77967857 is about 8829.9409397798. The cubic root of 77967857 is about 427.2071694787.

The spelling of 77967857 in words is "seventy-seven million, nine hundred sixty-seven thousand, eight hundred fifty-seven".