428780705 has 4 divisors (see below), whose sum is σ = 514536852. Its totient is φ = 343024560.

The previous prime is 428780699. The next prime is 428780711. The reversal of 428780705 is 507087824.

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

It is an interprime number because it is at equal distance from previous prime (428780699) and next prime (428780711).

It can be written as a sum of positive squares in 2 ways, for example, as 108513889 + 320266816 = 10417^2 + 17896^2 .

It is not a de Polignac number, because 428780705 - 2¹⁸ = 428518561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42878066 + ... + 42878075.

It is an arithmetic number, because the mean of its divisors is an integer number (128634213).

Almost surely, 2^428780705 is an apocalyptic number.

It is an amenable number.

428780705 is a deficient number, since it is larger than the sum of its proper divisors (85756147).

428780705 is an equidigital number, since it uses as much as digits as its factorization.

428780705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85756146.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 428780705 is about 20707.0206693286. The cubic root of 428780705 is about 754.0701416031.

The spelling of 428780705 in words is "four hundred twenty-eight million, seven hundred eighty thousand, seven hundred five".