77778380 has 48 divisors (see below), whose sum is σ = 169559040. Its totient is φ = 29937600.

The previous prime is 77778359. The next prime is 77778431. The reversal of 77778380 is 8387777.

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 15 ways as a sum of consecutive naturals, for example, 205031 + ... + 205409.

It is an arithmetic number, because the mean of its divisors is an integer number (3532480).

Almost surely, 2^77778380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77778380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84779520).

77778380 is an abundant number, since it is smaller than the sum of its proper divisors (91780660).

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

77778380 is a wasteful number, since it uses less digits than its factorization.

77778380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 460992, while the sum is 47.

The square root of 77778380 is about 8819.2051796066. The cubic root of 77778380 is about 426.8608233643.

The spelling of 77778380 in words is "seventy-seven million, seven hundred seventy-eight thousand, three hundred eighty".