77245221 has 8 divisors (see below), whose sum is σ = 104937120. Its totient is φ = 50525072.

The previous prime is 77245163. The next prime is 77245237. The reversal of 77245221 is 12254277.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77245221 - 2¹³ = 77237029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77245291) 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 7 ways as a sum of consecutive naturals, for example, 242751 + ... + 243068.

It is an arithmetic number, because the mean of its divisors is an integer number (13117140).

Almost surely, 2^77245221 is an apocalyptic number.

It is an amenable number.

77245221 is a deficient number, since it is larger than the sum of its proper divisors (27691899).

77245221 is a wasteful number, since it uses less digits than its factorization.

77245221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485875.

The product of its digits is 7840, while the sum is 30.

The square root of 77245221 is about 8788.9260436074. The cubic root of 77245221 is about 425.8832307964.

Adding to 77245221 its reverse (12254277), we get a palindrome (89499498).

The spelling of 77245221 in words is "seventy-seven million, two hundred forty-five thousand, two hundred twenty-one".