77550749 has 2 divisors, whose sum is σ = 77550750. Its totient is φ = 77550748.

The previous prime is 77550743. The next prime is 77550757. The reversal of 77550749 is 94705577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 18645124 = 7675^2 + 4318^2 .

It is an emirp because it is prime and its reverse (94705577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77550749 - 2⁸ = 77550493 is a prime.

It is a super-2 number, since 2×77550749² = 12028237340922002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77550743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38775374 + 38775375.

It is an arithmetic number, because the mean of its divisors is an integer number (38775375).

Almost surely, 2^77550749 is an apocalyptic number.

It is an amenable number.

77550749 is a deficient number, since it is larger than the sum of its proper divisors (1).

77550749 is an equidigital number, since it uses as much as digits as its factorization.

77550749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 308700, while the sum is 44.

The square root of 77550749 is about 8806.2903086373. The cubic root of 77550749 is about 426.4439907264.

The spelling of 77550749 in words is "seventy-seven million, five hundred fifty thousand, seven hundred forty-nine".