77878134 has 24 divisors (see below), whose sum is σ = 169210080. Its totient is φ = 25886448.

The previous prime is 77878109. The next prime is 77878159. The reversal of 77878134 is 43187877.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77878109) and next prime (77878159).

It is a self number, because there is not a number n which added to its sum of digits gives 77878134.

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 11 ways as a sum of consecutive naturals, for example, 712 + ... + 12500.

It is an arithmetic number, because the mean of its divisors is an integer number (7050420).

Almost surely, 2^77878134 is an apocalyptic number.

77878134 is an abundant number, since it is smaller than the sum of its proper divisors (91331946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77878134 is a wasteful number, since it uses less digits than its factorization.

77878134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12164 (or 12161 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 77878134 is about 8824.8588657270. The cubic root of 77878134 is about 427.0432343099.

The spelling of 77878134 in words is "seventy-seven million, eight hundred seventy-eight thousand, one hundred thirty-four".