77780136 has 64 divisors (see below), whose sum is σ = 222883200. Its totient is φ = 22157568.

The previous prime is 77780123. The next prime is 77780137. The reversal of 77780136 is 63108777.

It is a junction number, because it is equal to n+sod(n) for n = 77780094 and 77780103.

It is not an unprimeable number, because it can be changed into a prime (77780137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109350 + ... + 110058.

It is an arithmetic number, because the mean of its divisors is an integer number (3482550).

Almost surely, 2^77780136 is an apocalyptic number.

It is an amenable number.

77780136 is an abundant number, since it is smaller than the sum of its proper divisors (145103064).

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

77780136 is a wasteful number, since it uses less digits than its factorization.

77780136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 77780136 is about 8819.3047345015. The cubic root of 77780136 is about 426.8640357478.

The spelling of 77780136 in words is "seventy-seven million, seven hundred eighty thousand, one hundred thirty-six".