77305457 has 2 divisors, whose sum is σ = 77305458. Its totient is φ = 77305456.

The previous prime is 77305451. The next prime is 77305493. The reversal of 77305457 is 75450377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42719296 + 34586161 = 6536^2 + 5881^2 .

It is a cyclic number.

It is not a de Polignac number, because 77305457 - 2⁸ = 77305201 is a prime.

It is a super-2 number, since 2×77305457² = 11952267363957698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77305457.

It is not a weakly prime, because it can be changed into another prime (77305451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38652728 + 38652729.

It is an arithmetic number, because the mean of its divisors is an integer number (38652729).

Almost surely, 2^77305457 is an apocalyptic number.

It is an amenable number.

77305457 is a deficient number, since it is larger than the sum of its proper divisors (1).

77305457 is an equidigital number, since it uses as much as digits as its factorization.

77305457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102900, while the sum is 38.

The square root of 77305457 is about 8792.3521881235. The cubic root of 77305457 is about 425.9939036062.

The spelling of 77305457 in words is "seventy-seven million, three hundred five thousand, four hundred fifty-seven".