77770349 has 2 divisors, whose sum is σ = 77770350. Its totient is φ = 77770348.

The previous prime is 77770313. The next prime is 77770367. The reversal of 77770349 is 94307777.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77757124 + 13225 = 8818^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 77770349 - 2⁸ = 77770093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77770549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38885174 + 38885175.

It is an arithmetic number, because the mean of its divisors is an integer number (38885175).

Almost surely, 2^77770349 is an apocalyptic number.

It is an amenable number.

77770349 is a deficient number, since it is larger than the sum of its proper divisors (1).

77770349 is an equidigital number, since it uses as much as digits as its factorization.

77770349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259308, while the sum is 44.

The square root of 77770349 is about 8818.7498547130. The cubic root of 77770349 is about 426.8461310326.

The spelling of 77770349 in words is "seventy-seven million, seven hundred seventy thousand, three hundred forty-nine".