77955379 has 2 divisors, whose sum is σ = 77955380. Its totient is φ = 77955378.

The previous prime is 77955341. The next prime is 77955389. The reversal of 77955379 is 97355977.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77955379 - 2²¹ = 75858227 is a prime.

It is a super-2 number, since 2×77955379² = 12154082230067282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77955389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38977689 + 38977690.

It is an arithmetic number, because the mean of its divisors is an integer number (38977690).

Almost surely, 2^77955379 is an apocalyptic number.

77955379 is a deficient number, since it is larger than the sum of its proper divisors (1).

77955379 is an equidigital number, since it uses as much as digits as its factorization.

77955379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2083725, while the sum is 52.

The square root of 77955379 is about 8829.2343382651. The cubic root of 77955379 is about 427.1843781402.

The spelling of 77955379 in words is "seventy-seven million, nine hundred fifty-five thousand, three hundred seventy-nine".