77878345 has 16 divisors (see below), whose sum is σ = 98444160. Its totient is φ = 59027584.

The previous prime is 77878337. The next prime is 77878349. The reversal of 77878345 is 54387877.

It is a cyclic number.

It is not a de Polignac number, because 77878345 - 2³ = 77878337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77878349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9141 + ... + 15469.

It is an arithmetic number, because the mean of its divisors is an integer number (6152760).

Almost surely, 2^77878345 is an apocalyptic number.

It is an amenable number.

77878345 is a deficient number, since it is larger than the sum of its proper divisors (20565815).

77878345 is a wasteful number, since it uses less digits than its factorization.

77878345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6464.

The product of its digits is 1317120, while the sum is 49.

The square root of 77878345 is about 8824.8708205843. The cubic root of 77878345 is about 427.0436199810.

The spelling of 77878345 in words is "seventy-seven million, eight hundred seventy-eight thousand, three hundred forty-five".