428506215 has 32 divisors (see below), whose sum is σ = 717189120. Its totient is φ = 218059776.

The previous prime is 428506193. The next prime is 428506237. The reversal of 428506215 is 512605824.

It is an interprime number because it is at equal distance from previous prime (428506193) and next prime (428506237).

It is not a de Polignac number, because 428506215 - 2⁹ = 428505703 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163959 + ... + 166551.

It is an arithmetic number, because the mean of its divisors is an integer number (22412160).

Almost surely, 2^428506215 is an apocalyptic number.

428506215 is a deficient number, since it is larger than the sum of its proper divisors (288682905).

428506215 is a wasteful number, since it uses less digits than its factorization.

428506215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 428506215 is about 20700.3916629614. The cubic root of 428506215 is about 753.9091977185.

The spelling of 428506215 in words is "four hundred twenty-eight million, five hundred six thousand, two hundred fifteen".