77685426 has 64 divisors (see below), whose sum is σ = 212486400. Its totient is φ = 20487168.

The previous prime is 77685409. The next prime is 77685449. The reversal of 77685426 is 62458677.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 31 ways as a sum of consecutive naturals, for example, 2991 + ... + 12818.

It is an arithmetic number, because the mean of its divisors is an integer number (3320100).

Almost surely, 2^77685426 is an apocalyptic number.

77685426 is an abundant number, since it is smaller than the sum of its proper divisors (134800974).

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

77685426 is a wasteful number, since it uses less digits than its factorization.

77685426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15840 (or 15834 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 77685426 is about 8813.9336280687. The cubic root of 77685426 is about 426.6907065177.

The spelling of 77685426 in words is "seventy-seven million, six hundred eighty-five thousand, four hundred twenty-six".