77421685 has 8 divisors (see below), whose sum is σ = 101352096. Its totient is φ = 56306640.

The previous prime is 77421679. The next prime is 77421691. The reversal of 77421685 is 58612477.

It is an interprime number because it is at equal distance from previous prime (77421679) and next prime (77421691).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77421685 - 2⁷ = 77421557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703779 + ... + 703888.

It is an arithmetic number, because the mean of its divisors is an integer number (12669012).

Almost surely, 2^77421685 is an apocalyptic number.

It is an amenable number.

77421685 is a deficient number, since it is larger than the sum of its proper divisors (23930411).

77421685 is a wasteful number, since it uses less digits than its factorization.

77421685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407683.

The product of its digits is 94080, while the sum is 40.

The square root of 77421685 is about 8798.9593134643. The cubic root of 77421685 is about 426.2072892594.

The spelling of 77421685 in words is "seventy-seven million, four hundred twenty-one thousand, six hundred eighty-five".