77894647 has 2 divisors, whose sum is σ = 77894648. Its totient is φ = 77894646.

The previous prime is 77894639. The next prime is 77894653. The reversal of 77894647 is 74649877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77894647 - 2³ = 77894639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77894594 and 77894603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77894347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38947323 + 38947324.

It is an arithmetic number, because the mean of its divisors is an integer number (38947324).

Almost surely, 2^77894647 is an apocalyptic number.

77894647 is a deficient number, since it is larger than the sum of its proper divisors (1).

77894647 is an equidigital number, since it uses as much as digits as its factorization.

77894647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 52.

The square root of 77894647 is about 8825.7944118363. The cubic root of 77894647 is about 427.0734150817.

The spelling of 77894647 in words is "seventy-seven million, eight hundred ninety-four thousand, six hundred forty-seven".