212428777 has 4 divisors (see below), whose sum is σ = 231740496. Its totient is φ = 193117060.

The previous prime is 212428757. The next prime is 212428819. The reversal of 212428777 is 777824212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212428777 - 2⁷ = 212428649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212428757) 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, 9655843 + ... + 9655864.

It is an arithmetic number, because the mean of its divisors is an integer number (57935124).

Almost surely, 2^212428777 is an apocalyptic number.

It is an amenable number.

212428777 is a deficient number, since it is larger than the sum of its proper divisors (19311719).

212428777 is a wasteful number, since it uses less digits than its factorization.

212428777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19311718.

The product of its digits is 87808, while the sum is 40.

The square root of 212428777 is about 14574.9366036357. The cubic root of 212428777 is about 596.6749191386.

The spelling of 212428777 in words is "two hundred twelve million, four hundred twenty-eight thousand, seven hundred seventy-seven".