77253221 has 8 divisors (see below), whose sum is σ = 81688320. Its totient is φ = 72855072.

The previous prime is 77253203. The next prime is 77253223. The reversal of 77253221 is 12235277.

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 77253221 - 2¹⁸ = 76991077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77253223) 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, 4880 + ... + 13353.

It is an arithmetic number, because the mean of its divisors is an integer number (10211040).

Almost surely, 2^77253221 is an apocalyptic number.

It is an amenable number.

77253221 is a deficient number, since it is larger than the sum of its proper divisors (4435099).

77253221 is a wasteful number, since it uses less digits than its factorization.

77253221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18475.

The product of its digits is 5880, while the sum is 29.

The square root of 77253221 is about 8789.3811500014. The cubic root of 77253221 is about 425.8979326691.

Adding to 77253221 its reverse (12235277), we get a palindrome (89488498).

The spelling of 77253221 in words is "seventy-seven million, two hundred fifty-three thousand, two hundred twenty-one".