77642071 has 8 divisors (see below), whose sum is σ = 83936160. Its totient is φ = 71393952.

The previous prime is 77642063. The next prime is 77642093. The reversal of 77642071 is 17024677.

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

It is a cyclic number.

It is not a de Polignac number, because 77642071 - 2³ = 77642063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77642041) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7936 + ... + 14773.

It is an arithmetic number, because the mean of its divisors is an integer number (10492020).

Almost surely, 2^77642071 is an apocalyptic number.

77642071 is a deficient number, since it is larger than the sum of its proper divisors (6294089).

77642071 is a wasteful number, since it uses less digits than its factorization.

77642071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22985.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 77642071 is about 8811.4738267784. The cubic root of 77642071 is about 426.6113153158.

The spelling of 77642071 in words is "seventy-seven million, six hundred forty-two thousand, seventy-one".