77345977 has 4 divisors (see below), whose sum is σ = 78325120. Its totient is φ = 76366836.

The previous prime is 77345969. The next prime is 77345993. The reversal of 77345977 is 77954377.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77345977 - 2³ = 77345969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77345977.

It is not an unprimeable number, because it can be changed into a prime (77345077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489453 + ... + 489610.

It is an arithmetic number, because the mean of its divisors is an integer number (19581280).

Almost surely, 2^77345977 is an apocalyptic number.

It is an amenable number.

77345977 is a deficient number, since it is larger than the sum of its proper divisors (979143).

77345977 is an equidigital number, since it uses as much as digits as its factorization.

77345977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979142.

The product of its digits is 1296540, while the sum is 49.

The square root of 77345977 is about 8794.6561615563. The cubic root of 77345977 is about 426.0683194739.

Subtracting 77345977 from its reverse (77954377), we obtain a square (608400 = 780²).

The spelling of 77345977 in words is "seventy-seven million, three hundred forty-five thousand, nine hundred seventy-seven".