428657807 has 4 divisors (see below), whose sum is σ = 431930136. Its totient is φ = 425385480.

The previous prime is 428657711. The next prime is 428657819. The reversal of 428657807 is 708756824.

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 428657807 - 2¹⁰ = 428656783 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 (428657897) 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, 1635968 + ... + 1636229.

It is an arithmetic number, because the mean of its divisors is an integer number (107982534).

Almost surely, 2^428657807 is an apocalyptic number.

428657807 is a deficient number, since it is larger than the sum of its proper divisors (3272329).

428657807 is a wasteful number, since it uses less digits than its factorization.

428657807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272328.

The product of its (nonzero) digits is 752640, while the sum is 47.

The square root of 428657807 is about 20704.0529124131. The cubic root of 428657807 is about 753.9980903450.

The spelling of 428657807 in words is "four hundred twenty-eight million, six hundred fifty-seven thousand, eight hundred seven".