428813906 has 4 divisors (see below), whose sum is σ = 643220862. Its totient is φ = 214406952.

The previous prime is 428813897. The next prime is 428813963. The reversal of 428813906 is 609318824.

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

It can be written as a sum of positive squares in only one way, i.e., 268664881 + 160149025 = 16391^2 + 12655^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107203475 + ... + 107203478.

Almost surely, 2^428813906 is an apocalyptic number.

428813906 is a deficient number, since it is larger than the sum of its proper divisors (214406956).

428813906 is a wasteful number, since it uses less digits than its factorization.

428813906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214406955.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 428813906 is about 20707.8223384305. The cubic root of 428813906 is about 754.0896039502.

The spelling of 428813906 in words is "four hundred twenty-eight million, eight hundred thirteen thousand, nine hundred six".