77238221 has 8 divisors (see below), whose sum is σ = 78374400. Its totient is φ = 76106160.

The previous prime is 77238199. The next prime is 77238233. The reversal of 77238221 is 12283277.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77238221 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 (77238241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73820 + ... + 74858.

It is an arithmetic number, because the mean of its divisors is an integer number (9796800).

Almost surely, 2^77238221 is an apocalyptic number.

It is an amenable number.

77238221 is a deficient number, since it is larger than the sum of its proper divisors (1136179).

77238221 is a wasteful number, since it uses less digits than its factorization.

77238221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059.

The product of its digits is 9408, while the sum is 32.

The square root of 77238221 is about 8788.5278061801. The cubic root of 77238221 is about 425.8703658250.

The spelling of 77238221 in words is "seventy-seven million, two hundred thirty-eight thousand, two hundred twenty-one".