77685420 has 24 divisors (see below), whose sum is σ = 217519344. Its totient is φ = 20716096.

The previous prime is 77685409. The next prime is 77685449. The reversal of 77685420 is 2458677.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 647319 + ... + 647438.

It is an arithmetic number, because the mean of its divisors is an integer number (9063306).

Almost surely, 2^77685420 is an apocalyptic number.

It is an amenable number.

77685420 is an abundant number, since it is smaller than the sum of its proper divisors (139833924).

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

77685420 is a wasteful number, since it uses less digits than its factorization.

77685420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294769 (or 1294767 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 77685420 is about 8813.9332876985. The cubic root of 77685420 is about 426.6906955326.

The spelling of 77685420 in words is "seventy-seven million, six hundred eighty-five thousand, four hundred twenty".