77770223 has 4 divisors (see below), whose sum is σ = 82344960. Its totient is φ = 73195488.

The previous prime is 77770219. The next prime is 77770237. The reversal of 77770223 is 32207777.

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

It is a cyclic number.

It is not a de Polignac number, because 77770223 - 2² = 77770219 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 (77770213) 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, 2287343 + ... + 2287376.

It is an arithmetic number, because the mean of its divisors is an integer number (20586240).

Almost surely, 2^77770223 is an apocalyptic number.

77770223 is a deficient number, since it is larger than the sum of its proper divisors (4574737).

77770223 is a wasteful number, since it uses less digits than its factorization.

77770223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4574736.

The product of its (nonzero) digits is 28812, while the sum is 35.

The square root of 77770223 is about 8818.7427108404. The cubic root of 77770223 is about 426.8459005135.

The spelling of 77770223 in words is "seventy-seven million, seven hundred seventy thousand, two hundred twenty-three".