77449397 has 2 divisors, whose sum is σ = 77449398. Its totient is φ = 77449396.

The previous prime is 77449391. The next prime is 77449481. The reversal of 77449397 is 79394477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76720081 + 729316 = 8759^2 + 854^2 .

It is a cyclic number.

It is not a de Polignac number, because 77449397 - 2⁴ = 77449381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77449391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38724698 + 38724699.

It is an arithmetic number, because the mean of its divisors is an integer number (38724699).

Almost surely, 2^77449397 is an apocalyptic number.

It is an amenable number.

77449397 is a deficient number, since it is larger than the sum of its proper divisors (1).

77449397 is an equidigital number, since it uses as much as digits as its factorization.

77449397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 50.

The square root of 77449397 is about 8800.5339042583. The cubic root of 77449397 is about 426.2581348224.

The spelling of 77449397 in words is "seventy-seven million, four hundred forty-nine thousand, three hundred ninety-seven".