428140817 has 4 divisors (see below), whose sum is σ = 461074740. Its totient is φ = 395206896.

The previous prime is 428140799. The next prime is 428140829. The reversal of 428140817 is 718041824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 251888641 + 176252176 = 15871^2 + 13276^2 .

It is a cyclic number.

It is not a de Polignac number, because 428140817 - 2⁶ = 428140753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428148817) 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, 16466942 + ... + 16466967.

It is an arithmetic number, because the mean of its divisors is an integer number (115268685).

Almost surely, 2^428140817 is an apocalyptic number.

It is an amenable number.

428140817 is a deficient number, since it is larger than the sum of its proper divisors (32933923).

428140817 is a wasteful number, since it uses less digits than its factorization.

428140817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32933922.

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 428140817 is about 20691.5639089944. The cubic root of 428140817 is about 753.6948443498.

The spelling of 428140817 in words is "four hundred twenty-eight million, one hundred forty thousand, eight hundred seventeen".