77205049 has 4 divisors (see below), whose sum is σ = 77236864. Its totient is φ = 77173236.

The previous prime is 77205017. The next prime is 77205083. The reversal of 77205049 is 94050277.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94050277 = 29 ⋅3243113.

It is a cyclic number.

It is not a de Polignac number, because 77205049 - 2⁵ = 77205017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77200049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11937 + ... + 17230.

It is an arithmetic number, because the mean of its divisors is an integer number (19309216).

Almost surely, 2^77205049 is an apocalyptic number.

It is an amenable number.

77205049 is a deficient number, since it is larger than the sum of its proper divisors (31815).

77205049 is a wasteful number, since it uses less digits than its factorization.

77205049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31814.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 77205049 is about 8786.6403704715. The cubic root of 77205049 is about 425.8093899917.

It can be divided in two parts, 7720 and 5049, that added together give a square (12769 = 113²).

The spelling of 77205049 in words is "seventy-seven million, two hundred five thousand, forty-nine".