420828545 has 4 divisors (see below), whose sum is σ = 504994260. Its totient is φ = 336662832.

The previous prime is 420828521. The next prime is 420828559. The reversal of 420828545 is 545828024.

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 283282561 + 137545984 = 16831^2 + 11728^2 .

It is a cyclic number.

It is not a de Polignac number, because 420828545 - 2⁶ = 420828481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420828499 and 420828508.

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, 42082850 + ... + 42082859.

It is an arithmetic number, because the mean of its divisors is an integer number (126248565).

Almost surely, 2^420828545 is an apocalyptic number.

It is an amenable number.

420828545 is a deficient number, since it is larger than the sum of its proper divisors (84165715).

420828545 is an equidigital number, since it uses as much as digits as its factorization.

420828545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84165714.

The product of its (nonzero) digits is 102400, while the sum is 38.

The square root of 420828545 is about 20514.1060005061. The cubic root of 420828545 is about 749.3793650766.

The spelling of 420828545 in words is "four hundred twenty million, eight hundred twenty-eight thousand, five hundred forty-five".