428607291 has 16 divisors (see below), whose sum is σ = 657504000. Its totient is φ = 243272928.

The previous prime is 428607287. The next prime is 428607299. The reversal of 428607291 is 192706824.

It is not a de Polignac number, because 428607291 - 2² = 428607287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428607299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65361 + ... + 71618.

It is an arithmetic number, because the mean of its divisors is an integer number (41094000).

Almost surely, 2^428607291 is an apocalyptic number.

428607291 is a deficient number, since it is larger than the sum of its proper divisors (228896709).

428607291 is a wasteful number, since it uses less digits than its factorization.

428607291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137138.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 428607291 is about 20702.8329220906. The cubic root of 428607291 is about 753.9684703986.

The spelling of 428607291 in words is "four hundred twenty-eight million, six hundred seven thousand, two hundred ninety-one".