77245117 has 4 divisors (see below), whose sum is σ = 77345820. Its totient is φ = 77144416.

The previous prime is 77245097. The next prime is 77245141. The reversal of 77245117 is 71154277.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1572516 + 75672601 = 1254^2 + 8699^2 .

It is a cyclic number.

It is not a de Polignac number, because 77245117 - 2⁷ = 77244989 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77245417) 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, 49192 + ... + 50737.

It is an arithmetic number, because the mean of its divisors is an integer number (19336455).

Almost surely, 2^77245117 is an apocalyptic number.

It is an amenable number.

77245117 is a deficient number, since it is larger than the sum of its proper divisors (100703).

77245117 is an equidigital number, since it uses as much as digits as its factorization.

77245117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100702.

The product of its digits is 13720, while the sum is 34.

The square root of 77245117 is about 8788.9201270691. The cubic root of 77245117 is about 425.8830396653.

The spelling of 77245117 in words is "seventy-seven million, two hundred forty-five thousand, one hundred seventeen".