77970047 has 4 divisors (see below), whose sum is σ = 78030480. Its totient is φ = 77909616.

The previous prime is 77970037. The next prime is 77970071. The reversal of 77970047 is 74007977.

It is a happy number.

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 77970047 - 2⁴ = 77970031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77969986 and 77970013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77970037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28238 + ... + 30875.

It is an arithmetic number, because the mean of its divisors is an integer number (19507620).

Almost surely, 2^77970047 is an apocalyptic number.

77970047 is a deficient number, since it is larger than the sum of its proper divisors (60433).

77970047 is a wasteful number, since it uses less digits than its factorization.

77970047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60432.

The product of its (nonzero) digits is 86436, while the sum is 41.

The square root of 77970047 is about 8830.0649487985. The cubic root of 77970047 is about 427.2111693105.

The spelling of 77970047 in words is "seventy-seven million, nine hundred seventy thousand, forty-seven".