77400077 has 2 divisors, whose sum is σ = 77400078. Its totient is φ = 77400076.

The previous prime is 77400019. The next prime is 77400079. The reversal of 77400077 is 77000477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42954916 + 34445161 = 6554^2 + 5869^2 .

It is a cyclic number.

It is not a de Polignac number, because 77400077 - 2⁸ = 77399821 is a prime.

Together with 77400079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77400079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38700038 + 38700039.

It is an arithmetic number, because the mean of its divisors is an integer number (38700039).

Almost surely, 2^77400077 is an apocalyptic number.

It is an amenable number.

77400077 is a deficient number, since it is larger than the sum of its proper divisors (1).

77400077 is an equidigital number, since it uses as much as digits as its factorization.

77400077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9604, while the sum is 32.

The square root of 77400077 is about 8797.7313552984. The cubic root of 77400077 is about 426.1676348051.

The spelling of 77400077 in words is "seventy-seven million, four hundred thousand, seventy-seven".