77948687 has 2 divisors, whose sum is σ = 77948688. Its totient is φ = 77948686.

The previous prime is 77948683. The next prime is 77948693. The reversal of 77948687 is 78684977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77948687 - 2² = 77948683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77948681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38974343 + 38974344.

It is an arithmetic number, because the mean of its divisors is an integer number (38974344).

Almost surely, 2^77948687 is an apocalyptic number.

77948687 is a deficient number, since it is larger than the sum of its proper divisors (1).

77948687 is an equidigital number, since it uses as much as digits as its factorization.

77948687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4741632, while the sum is 56.

The square root of 77948687 is about 8828.8553618235. The cubic root of 77948687 is about 427.1721540546.

The spelling of 77948687 in words is "seventy-seven million, nine hundred forty-eight thousand, six hundred eighty-seven".