77972927 has 4 divisors (see below), whose sum is σ = 78489456. Its totient is φ = 77456400.

The previous prime is 77972893. The next prime is 77972929. The reversal of 77972927 is 72927977.

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

It is a cyclic number.

It is not a de Polignac number, because 77972927 - 2¹² = 77968831 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 (77972929) 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, 258038 + ... + 258339.

It is an arithmetic number, because the mean of its divisors is an integer number (19622364).

Almost surely, 2^77972927 is an apocalyptic number.

77972927 is a deficient number, since it is larger than the sum of its proper divisors (516529).

77972927 is a wasteful number, since it uses less digits than its factorization.

77972927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516528.

The product of its digits is 777924, while the sum is 50.

The square root of 77972927 is about 8830.2280265008. The cubic root of 77972927 is about 427.2164292492.

The spelling of 77972927 in words is "seventy-seven million, nine hundred seventy-two thousand, nine hundred twenty-seven".