77647001 has 4 divisors (see below), whose sum is σ = 77702400. Its totient is φ = 77591604.

The previous prime is 77646997. The next prime is 77647013. The reversal of 77647001 is 10074677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10074677 = 191 ⋅52747.

It is a cyclic number.

It is not a de Polignac number, because 77647001 - 2² = 77646997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77647061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25541 + ... + 28418.

It is an arithmetic number, because the mean of its divisors is an integer number (19425600).

Almost surely, 2^77647001 is an apocalyptic number.

It is an amenable number.

77647001 is a deficient number, since it is larger than the sum of its proper divisors (55399).

77647001 is a wasteful number, since it uses less digits than its factorization.

77647001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55398.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 77647001 is about 8811.7535712252. The cubic root of 77647001 is about 426.6203445669.

The spelling of 77647001 in words is "seventy-seven million, six hundred forty-seven thousand, one".