77420771 has 4 divisors (see below), whose sum is σ = 81974952. Its totient is φ = 72866592.

The previous prime is 77420747. The next prime is 77420789. The reversal of 77420771 is 17702477.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77420771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77420731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277065 + ... + 2277098.

It is an arithmetic number, because the mean of its divisors is an integer number (20493738).

Almost surely, 2^77420771 is an apocalyptic number.

77420771 is a deficient number, since it is larger than the sum of its proper divisors (4554181).

77420771 is a wasteful number, since it uses less digits than its factorization.

77420771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554180.

The product of its (nonzero) digits is 19208, while the sum is 35.

The square root of 77420771 is about 8798.9073753506. The cubic root of 77420771 is about 426.2056120592.

The spelling of 77420771 in words is "seventy-seven million, four hundred twenty thousand, seven hundred seventy-one".