77438461 has 2 divisors, whose sum is σ = 77438462. Its totient is φ = 77438460.

The previous prime is 77438437. The next prime is 77438489. The reversal of 77438461 is 16483477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77352025 + 86436 = 8795^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 77438461 - 2⁹ = 77437949 is a prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38719230 + 38719231.

It is an arithmetic number, because the mean of its divisors is an integer number (38719231).

Almost surely, 2^77438461 is an apocalyptic number.

It is an amenable number.

77438461 is a deficient number, since it is larger than the sum of its proper divisors (1).

77438461 is an equidigital number, since it uses as much as digits as its factorization.

77438461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 40.

The square root of 77438461 is about 8799.9125563837. The cubic root of 77438461 is about 426.2380710622.

The spelling of 77438461 in words is "seventy-seven million, four hundred thirty-eight thousand, four hundred sixty-one".